{"id":256852,"date":"2026-03-04T14:25:18","date_gmt":"2026-03-04T14:25:18","guid":{"rendered":"https:\/\/invimed.pl\/?page_id=256852"},"modified":"2026-03-25T11:58:12","modified_gmt":"2026-03-25T11:58:12","slug":"kalkulator-dni-plodnych-2","status":"publish","type":"page","link":"https:\/\/invimed.pl\/en\/kalkulator-dni-plodnych","title":{"rendered":"Fertile day calculator"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"najwazniejsze-informacje\"><strong>Highlights<\/strong><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The fertile days calculator requires knowledge of the date of the first day of your last period and the average length of your cycle.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Couples who have intercourse a day or two before ovulation have the best chance of getting pregnant.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fertile days last 4-6 days, as sperm survive in the genital tract for up to five days.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stress, illness or eating disorders can postpone ovulation or stop it altogether.<\/li>\n<\/ul>\n\n\n\n<section class=\"cta-3\">\n\t\t<div class=\"container cta-3__container\">\n\t\t<div class=\"position-relative cta-3__wrapper\">\n\t\t            <a\n            class=\"cta-3__link\"\n            href=\"#section-2\"\n            target=\"_self\"\n            aria-label=\"cta-3\"\n            >\n            <\/a>\n                            <div class=\"acf-innerblocks-container\">\n\n<p><strong>What can be done to get pregnant?<\/strong><\/p>\n\n\n\n<p>If you want to become a mum, make sure you try for a baby at the best time of your cycle. <strong>Find out when your fertile days and ovulation are,<\/strong> so as not to miss them the following month.<\/p>\n\n\n\n<p class=\"has-text-align-center\">or <\/p>\n\n\n\n<p class=\"has-text-align-center\">If you are concerned about your lack of pregnancy and suspect that your difficulties in getting pregnant may be rooted in health problems, <strong>Make an appointment at Invimed.<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-a89b3969 wp-block-buttons-is-layout-flex\" id=\"https:\/\/www.invimed.pl\/konsultacja-z-monitoringiem-cyklu\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" role=\"button\" tabindex=\"0\">Write a message<\/a><\/div>\n<\/div>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"tel:+48500900888\"><strong>Call 500 900 888<\/strong><\/a><\/p>\n\n<\/div>\n                            <a class=\"cta-3__link cta-3__link--mobile\" href=\"#section-2\" target=\"_self\" aria-label=\"Check out\">\n                Check out            <\/a>\n        \t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n<section class=\"calculator has-text-align-left block-spacing--pt block-spacing--pb\">\n\t\t\t\t\t<div class=\"calculator__heading\">\n    <div class=\"calculator__icon\">\n        <svg width=\"22\" height=\"20\">\n            <use xlink:href=\"#icon-calculator-symbols\"\/>\n        <\/svg>\n    <\/div>\n    <div class=\"acf-innerblocks-container\">\n\n<h2 class=\"wp-block-heading\" id=\"kalkulator-dni-plodnych\">Fertile day calculator<\/h2>\n\n<\/div>\n<\/div>\n<div class=\"ovulation-calc calculator__wrap\">\n        <div class=\"ovulation-calc__content\">\n                <h3 class=\"ovulation-calc__title h2\">What can be done to get pregnant?<\/h3>\n                        <div class=\"ovulation-calc__description\"><p>If you want to become a mum, make sure you try for a baby at the best time of your cycle. <a href=\"https:\/\/invimed.pl\/en\/blog\/ovulation-how-to-recognize-the-symptoms-how-to-determine-it-and-when-to-start-trying-for-a-baby\/\">Find out when your fertile days and ovulation are<\/a>in order not to miss them in the following month<\/p>\n<\/div>\n            <\/div>\n        <form class=\"ovulation-calc__calculator calculator__form\" aria-labelledby=\"ovulation-calc__heading\" action=\"\">\n        <div class=\"ovulation-calc__input-container\">\n            <label for=\"ovulation-calc-date\" class=\"ovulation-calc__label\">\n                Date of your last menstrual period                <div class=\"ovulation-calc__label__info\">\n                    <svg width=\"3\" height=\"8\">\n                        <use xlink:href=\"#icon-info\"\/>\n                    <\/svg>\n                    <div class=\"ovulation-calc__label__info__content\">\n                        It is the first day of menstrual bleeding                    <\/div>\n                <\/div>\n            <\/label>\n            <div class=\"ovulation-calc__input-inner\">\n                <input name=\"date\" id=\"ovulation-calc-date\" type=\"date\" placeholder=\"Select a date\" class=\"ovulation-calc__input\" required>\n                <svg width=\"20\" height=\"22\" fill=\"#ffffff\">\n                    <use xlink:href=\"#icon-calendar\"\/>\n                <\/svg>\n            <\/div>\n\n        <\/div>\n        <div class=\"ovulation-calc__input-container ovulation-calc__input-container--select\">\n            <label for=\"ovulation-calc-cycle-length\" class=\"ovulation-calc__label\">\n                Cycle length                <div class=\"ovulation-calc__label__info\">\n                    <svg width=\"3\" height=\"8\">\n                        <use xlink:href=\"#icon-info\"\/>\n                    <\/svg>\n                    <div class=\"ovulation-calc__label__info__content\">\n                        The menstrual cycle begins with the first day of bleeding and ends just before the next menstruation                    <\/div>\n                <\/div>\n            <\/label>\n            <select name=\"cycle-length\" id=\"ovulation-calc-cycle-length\" class=\"ovulation-calc__cycle-length calculator__select\" required>\n                <option hidden value=\"\">Select<\/option>\n                                <option value=\"25\">25<\/option>\n                                <option value=\"26\">26<\/option>\n                                <option value=\"27\">27<\/option>\n                                <option value=\"28\">28<\/option>\n                                <option value=\"29\">29<\/option>\n                                <option value=\"30\">30<\/option>\n                                <option value=\"31\">31<\/option>\n                                <option value=\"32\">32<\/option>\n                                <option value=\"33\">33<\/option>\n                                <option value=\"34\">34<\/option>\n                                <option value=\"35\">35<\/option>\n                            <\/select>\n        <\/div>\n        <div class=\"ovulation-calc__button-container wp-block-button calculator__footer\">\n            <button type=\"submit\" class=\"ovulation-calc__submit wp-block-button__link wp-element-button calculator__submit is-style-dark\" aria-label=\"Calculate, click and check when your fertile days and ovulation are\" disabled>Calculate<\/button>\n        <\/div>\n    <input type=\"hidden\" name=\"trp-form-language\" value=\"en\"\/><\/form>\n    <div class=\"ovulation-calc__result\" style=\"display:none;\" aria-live=\"polite\" tabindex=\"-1\">\n    <\/div>\n    <div class=\"ovulation-calc__result-legend\">\n        <span class=\"ovulation-calc__result-legend_item ovulation-calc__result-legend_item--start\">\n            Start of the period        <\/span>\n        <span class=\"ovulation-calc__result-legend_item ovulation-calc__result-legend_item--ovulation\">\n            Ovulation        <\/span>\n        <span class=\"ovulation-calc__result-legend_item ovulation-calc__result-legend_item--highest\">\n            Fertile days - high chance        <\/span>\n        <span class=\"ovulation-calc__result-legend_item ovulation-calc__result-legend_item--lowest\">\n            Fertile days - low chance        <\/span>\n    <\/div>\n<\/div><\/section>\n\n\n\n<p>The fertile days in a woman's monthly cycle are, as the name suggests, the most appropriate time to start trying for a baby.&nbsp;<strong>Fertile days and infertile days<\/strong>&nbsp;can be determined in several ways, including with the help of a so-called ovulation calculator. Assuming your cycle is regular and lasts about 28 days, it allows you to determine ovulation and the accompanying fertile days quite accurately. Using a fertile days calculator helps you to create a calendar of your fertile days and to keep a marriage diary as a&nbsp;<strong>methods of natural contraception<\/strong>.&nbsp;<\/p>\n\n\n\n<section class=\"cta-3\">\n\t\t<div class=\"container cta-3__container\">\n\t\t<div class=\"position-relative cta-3__wrapper\">\n\t\t                    <div class=\"acf-innerblocks-container\">\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-color-12-color\"><strong>Pregnancy and fertile days<\/strong><\/mark><\/p>\n\n\n\n<p>Doctors stress that couples who know when they are&nbsp;<strong>fertile days<\/strong>and consciously engage in intercourse at that time, are statistically more likely to achieve pregnancy than those who happen to miss the woman's fertile phase.&nbsp;<\/p>\n\n<\/div>\n                \t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"kalkulator-owulacji-%e2%80%93-kiedy-jajeczkowanie\">Ovulation calculator - when do you ovulate?<\/h2>\n\n\n\n<p><strong>Fertile day calculator<\/strong>&nbsp;is a convenient and simple way to determine your ovulation date and fertile days. Its other names are: ovulation calculator, ovulation calendar or marriage calendar. To check when your fertile days fall in the following months, enter in the relevant fields of the fertile days calculator:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The date of the first day of your last menstrual period.<\/li>\n\n\n\n<li>The average length of your cycle.<\/li>\n<\/ol>\n\n\n\n<p>The ovulation calculator will calculate the date of your fertile phase and the predicted day of ovulation for your next cycles, in addition to indicating on which days your chances of getting pregnant are higher. You can create your own&nbsp;<strong>calendar of fertile days<\/strong>.<\/p>\n\n\n\n<section class=\"cta-3\">\n\t\t<div class=\"container cta-3__container\">\n\t\t<div class=\"position-relative cta-3__wrapper\">\n\t\t            <a\n            class=\"cta-3__link\"\n            href=\"https:\/\/invimed.pl\/en\/konsultacja-z-monitoringiem-cyklu\/\"\n            target=\"_blank\" rel=\"noopener noreferrer\"\n            aria-label=\"cta-3\"\n            >\n            <\/a>\n                            <div class=\"acf-innerblocks-container\">\n\n<h6 class=\"wp-block-heading has-text-align-center\"><strong>Make an appointment for a consultation with cycle monitoring<\/strong><\/h6>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-text-align-center\">If you are not yet an Invimed patient and want to be sure of your ovulation date, make an appointment for a consultation with cycle monitoring at the Invimed clinic of your choice. Our gynaecologist will help you to accurately determine the day on which your chances of conceiving are the best.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-a89b3969 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/invimed.pl\/en\/how-to-get-pregnant-cycle-monitoring-consultation\/\">Read more<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<\/div>\n                            <a class=\"cta-3__link cta-3__link--mobile\" href=\"https:\/\/invimed.pl\/en\/konsultacja-z-monitoringiem-cyklu\/\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"More\">\n                More            <\/a>\n        \t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"co-to-jest-owulacja\">What is ovulation?<\/h2>\n\n\n\n<p>Ovulation (ovulation) is the day in a woman's menstrual cycle when the Graaf follicle ruptures and a mature ovum is released from the ovary. After ovulation, the ovum is caught by the oviduct stroma and is then moved down the oviduct towards the uterus - if sperm are in its path, fertilisation can occur.<\/p>\n\n\n\n<p><strong>Day of ovulation&nbsp;<\/strong>is not the only one in which a woman can become pregnant. The number of fertile days is set at four to six due to the fact that sperm can survive in the genital tract for up to five days, i.e. fertilisation can occur as a result of sexual intercourse that took place a few days before ovulation.<\/p>\n\n\n\n<section class=\"cta-3\">\n\t\t<div class=\"container cta-3__container\">\n\t\t<div class=\"position-relative cta-3__wrapper\">\n\t\t                    <div class=\"acf-innerblocks-container\">\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-color-12-color\">When is your best chance of getting pregnant?<\/mark><\/strong><\/p>\n\n\n\n<p>Couples who have intercourse a day or two before ovulation, or on the day of ovulation, have the best chance of conceiving. Calculate your fertile days and try just then.<\/p>\n\n<\/div>\n                \t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n<p>By design&nbsp;<strong>ovulation&nbsp;<\/strong>should take place once a month, but in the case of the growth of two follicles and the release of two ova a few hours apart, ovulation can occur again within the same cycle. This is a relatively rare occurrence, but one that cannot be predicted. Another deviation from the norm are so-called non-ovulatory cycles. These are menstrual cycles during which ovulation does not occur - usually due to severe stress, eating disorders, neurosis or depression.<\/p>\n\n\n\n<section class=\"check-list\">\n\t    <header class=\"check-list__header\">\n        <div class=\"acf-innerblocks-container\">\n\n<h2 class=\"wp-block-heading\" id=\"jak-obliczyc-dni-plodne\">How do you calculate your fertile days?<\/h2>\n\n\n\n<p>If you are planning to start trying for a baby, it is essential to&nbsp;<strong>calculate the fertile days in your cycle using the ovulation calculator<\/strong>. Before using a fertile day calculator, record your period dates for at least two to three months to ascertain the average length of your menstrual cycle. You will determine your ovulation day and fertile days even more accurately if, in addition to the calculator, you:<\/p>\n\n<\/div>\n    <\/header>\n    <ul class=\"mb-0 p-0 check-list__inner\">\n            <li class=\"d-flex check-list__item\">\n            <div class=\"svg-container\">\n                <svg width=\"16\" height=\"16\">\n                    <use xlink:href=\"#icon-check-2\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"check-list__item__rte\">\n                <p>note the dates of menstruation in successive cycles and record symptoms indicating ovulation on specific days;<\/p>\n            <\/div>\n        <\/li>\n            <li class=\"d-flex check-list__item\">\n            <div class=\"svg-container\">\n                <svg width=\"16\" height=\"16\">\n                    <use xlink:href=\"#icon-check-2\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"check-list__item__rte\">\n                <p>use home ovulation tests to confirm the date of ovulation (diagnostic strip tests detect an increase in the concentration of the hormone LH in a woman's urine); ovulation tests are simple to use and useful for planning a pregnancy, but are not recommended for women with PCOS because, due to the specific course of this condition, they give a positive result despite the absence of ovulation;<\/p>\n            <\/div>\n        <\/li>\n            <li class=\"d-flex check-list__item\">\n            <div class=\"svg-container\">\n                <svg width=\"16\" height=\"16\">\n                    <use xlink:href=\"#icon-check-2\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"check-list__item__rte\">\n                <p>check the basal body temperature first thing in the morning (the temperature drops during ovulation and then rises by about half a degree).<\/p>\n            <\/div>\n        <\/li>\n        <\/ul>\n<\/section>\n\n\n\n<section class=\"cta-3\">\n\t\t<div class=\"container cta-3__container\">\n\t\t<div class=\"position-relative cta-3__wrapper\">\n\t\t                    <div class=\"acf-innerblocks-container\">\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-color-12-color\">Worth remembering!<\/mark><\/strong><\/p>\n\n\n\n<p>Calculating ovulation should not pose a major challenge. However, the ovulation process can be delayed, for example due to a cold or severe stress. Therefore, it is advisable to rely not only on the calendar of fertile days, but also on your own observations and, if necessary, use professional cycle monitoring at Invimed.<\/p>\n\n<\/div>\n                \t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"dni-plodne-i-nieplodne\">Fertile and infertile days<\/h2>\n\n\n\n<p>Division into&nbsp;<strong>fertile days and infertile days<\/strong>&nbsp;within the menstrual cycle appeals to the imagination, but is largely conventional. For women with regular cycles, it is admittedly possible to observe a clear recurrence in the pattern of successive ovulations - and thus successfully predict periods,&nbsp;<strong>days of highest fertility<\/strong>&nbsp;- But the influence of external factors on the ovulation process can never be ruled out.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"faza-nieplodnosci-wzglednej\">Relative infertility phase<\/h3>\n\n\n\n<p>The first phase of the cycle is the so-called&nbsp;<strong>relative infertility phase<\/strong>. It coincides with the time of menstrual bleeding and the maturation of the ovum. Theoretically, fertilisation should not occur during this period, as it is still in the Graaf follicle. In practice - especially in women with a short menstrual cycle - it may happen that the maturation of the ovum is completed earlier and that the sperm present in the genital tract after intercourse shortly after the end of menstruation survives long enough for fertilisation to occur.<\/p>\n\n\n\n<p>Although&nbsp;<strong>no relative infertility phase<\/strong>&nbsp;is rather a deviation from the norm, it is worth bearing this in mind when deciding to use a fertility day calculator or the so-called marital calendar as a form of contraception. Refraining from intercourse on fertile days may work if a woman has regular, longer cycles, but you never know if in a given month, for some reason, her cycle may turn out to be shorter than usual.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"faza-plodna\">Fertile phase<\/h3>\n\n\n\n<p><strong>Fertile phase<\/strong>The fertile phase of the cycle, i.e. ovulation and at least 2-3 days before ovulation and at least one day after the end of ovulation, is the ideal time to try to have a baby (or conversely, the right time to avoid intercourse if the couple is not using contraception and is not planning to enlarge the family). If the mature ovum is not fertilised within 24 hours, it will start to die and thus the fertile phase of the cycle will come to an end. Of course, it is impossible to say \"by eye\" how long the cell has been alive and ready to be fertilised - perhaps in some women ovulation takes a little longer and thus the fertile phase ends later, when the third and final phase of the menstrual cycle has officially begun: the absolute infertility phase.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"faza-nieplodnosci-bezwzglednej\">Absolute infertility phase<\/h3>\n\n\n\n<p>In the days leading up to the next menstrual period there is&nbsp;<strong>absolute infertility phase<\/strong>. During ovulation, theoretically, fertilisation can no longer occur because the ovum has died. This means that couples who are not planning a pregnancy and are not using contraceptives can then have intercourse without fear (only the slight risk of a second ovulation in the same cycle has to be taken into account).&nbsp;<\/p>\n\n\n\n<p>It is also important to remember that if intercourse occurred during infertile days, sperm can survive in the woman's body until the fertile days and lead to successful fertilisation.<\/p>\n\n\n\n<section class=\"cta-3\">\n\t\t<div class=\"container cta-3__container\">\n\t\t<div class=\"position-relative cta-3__wrapper\">\n\t\t                    <div class=\"acf-innerblocks-container\">\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-color-12-color\">Pregnancy prevention method<\/mark><\/strong><\/p>\n\n\n\n<p>With the help of a fertile days calculator, you can determine when you are least likely to get pregnant. However, it is important to remember that the fertile days calendar should not be used as the only method of preventing pregnancy.<\/p>\n\n<\/div>\n                \t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n<section class=\"check-list\">\n\t    <header class=\"check-list__header\">\n        <div class=\"acf-innerblocks-container\">\n\n<h2 class=\"wp-block-heading\" id=\"dni-plodne-%e2%80%93-objawy-plodnosci\">Fertile days - fertility symptoms<\/h2>\n\n\n\n<p><strong>Signs of fertility&nbsp;<\/strong>appearing during the fertile days help to confirm the calculations made with the ovulation calculator. Changes in the concentration of sex hormones in the days leading up to ovulation mean that the following symptoms may appear during fertile days:<\/p>\n\n\n\n<p><\/p>\n\n<\/div>\n    <\/header>\n    <ul class=\"mb-0 p-0 check-list__inner\">\n            <li class=\"d-flex check-list__item\">\n            <div class=\"svg-container\">\n                <svg width=\"16\" height=\"16\">\n                    <use xlink:href=\"#icon-check-2\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"check-list__item__rte\">\n                <p><strong>acute lower abdominal pain<\/strong>\u00a0- occurs just before ovulation; may be intermittent or every month; if pain is so severe that it prevents intercourse, a doctor should be consulted as it may be related to endometriosis or the presence of pelvic adhesions;<\/p>\n            <\/div>\n        <\/li>\n            <li class=\"d-flex check-list__item\">\n            <div class=\"svg-container\">\n                <svg width=\"16\" height=\"16\">\n                    <use xlink:href=\"#icon-check-2\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"check-list__item__rte\">\n                <p><strong>thin, clear cervical mucus<\/strong>\u00a0- mucus during ovulation resembles egg white, namely it is sticky and viscous; the change in the appearance and consistency of vaginal discharge is intended to facilitate the passage of sperm through the genital tract towards the ovum, in addition to having a beneficial effect on the woman's sensations during intercourse;<\/p>\n            <\/div>\n        <\/li>\n            <li class=\"d-flex check-list__item\">\n            <div class=\"svg-container\">\n                <svg width=\"16\" height=\"16\">\n                    <use xlink:href=\"#icon-check-2\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"check-list__item__rte\">\n                <p><strong>breast tenderness<\/strong>\u00a0- just after ovulation, the breasts are more sensitive to touch and there may be a feeling of heaviness and slight pain;<\/p>\n            <\/div>\n        <\/li>\n            <li class=\"d-flex check-list__item\">\n            <div class=\"svg-container\">\n                <svg width=\"16\" height=\"16\">\n                    <use xlink:href=\"#icon-check-2\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"check-list__item__rte\">\n                <p><strong>increase in libido<\/strong>\u00a0- When the fertile phase of the menstrual cycle begins, a woman's sexual desire naturally increases; interestingly, her appearance also improves during the fertile days: her complexion is smoother, her lips look fuller, even her movements become more sensual; however, if a woman is stressed or experiencing symptoms of depression or neurosis, she may not notice or feel a greater desire for sex than usual during ovulation.<\/p>\n            <\/div>\n        <\/li>\n        <\/ul>\n<\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"poziom-hormonow-a-faza-cyklu-miesiaczkowego\">Hormone levels and menstrual cycle phase<\/h2>\n\n\n\n<p>The course of the menstrual cycle (the occurrence of the various phases of the menstrual cycle) is closely dependent on changes in the levels of the individual sex hormones.&nbsp;<strong>Ovulation and hormones<\/strong>&nbsp;go hand in hand.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"770\" height=\"411\" data-id=\"256857\" src=\"https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1.jpg\" alt=\"\" class=\"wp-image-256857\" srcset=\"https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1.jpg 770w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-300x160.jpg 300w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-768x410.jpg 768w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-380x203.jpg 380w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-54x29.jpg 54w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-411x219.jpg 411w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-71x38.jpg 71w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-442x236.jpg 442w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-734x392.jpg 734w, 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https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-272x145.jpg 272w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-135x72.jpg 135w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-45x24.jpg 45w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-500x267.jpg 500w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-585x312.jpg 585w, https:\/\/invimed.pl\/wp-content\/uploads\/2024\/05\/kalkulator-dni-plodnych-poziom-hormonow-jpg-1-75x40.jpg 75w\" sizes=\"auto, (max-width: 770px) 100vw, 770px\" \/><\/figure>\n<\/figure>\n\n\n\n<p><sup><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-basic-placeholder-color\">Hormone levels in the menstrual cycle: LH - lutropin, FSH - folliculotropin, oestrogen and progesterone.<\/mark><\/sup><\/p>\n\n\n\n<section class=\"check-list\">\n\t    <header class=\"check-list__header\">\n        <div class=\"acf-innerblocks-container\">\n\n<p>In order for ovulation to occur, rising estrogen concentrations during the follicular phase (which lasts from the first day of menstruation to the day of ovulation) must stimulate the pituitary gland to produce<strong> luteinising hormone (LH)<\/strong>. The increased amount of oestrogen in the body also causes a temporary increase in the thickness of the endometrium, thus preparing the uterus for the eventuality of pregnancy.<\/p>\n\n\n\n<p>During the follicular phase, the concentration of the&nbsp;<strong>folliculotropic hormone (FSH)<\/strong>which is responsible for the transformation within the ovarian follicle leading to the mature ovum. The rupture of the follicle and the release of the cell into the fallopian tube requires the hormone LH, which is secreted from the pituitary gland into the blood in the form of a brief peak just before ovulation.<\/p>\n\n\n\n<section class=\"cta-3\">\n\t\t<div class=\"container cta-3__container\">\n\t\t<div class=\"position-relative cta-3__wrapper\">\n\t\t                    <div class=\"acf-innerblocks-container\">\n\n<p class=\"has-text-align-center\">You can read more about folliculotropic hormone on the website: <a href=\"https:\/\/invimed.pl\/en\/research\/fsh\/\" target=\"_blank\" rel=\"noreferrer noopener\">FSH<\/a>.<\/p>\n\n<\/div>\n                \t\t<\/div>\n\t<\/div>\n<\/section>\n\n<\/div>\n    <\/header>\n<\/section>\n\n\n\n<p><strong>Changes in hormone levels during the menstrual cycle<\/strong>&nbsp;can be detected by a blood test, which is why hormone determinations are carried out as standard in women who are trying unsuccessfully to have a baby, as part of ovulation monitoring (this is called cycle monitoring). Determining whether a patient is ovulating is the first step to taking further measures to achieve pregnancy (e.g. to implement drug treatment). To find out more about cycle monitoring, click on the link below:<\/p>\n\n\n\n<p><a href=\"https:\/\/invimed.pl\/en\/cycle-monitoring\/\" target=\"_blank\" rel=\"noreferrer noopener\">Cycle monitoring - ovulation monitoring<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"skonsultuj-sie-z-ginekologiem\">Consult your gynaecologist<\/h2>\n\n\n\n<p>At the beginning of your efforts to have a baby, a fertile days calculator or a marriage diary may be helpful, but in many cases will not give reliable results. If you want to be sure, use the help of the specialists at the infertility clinics Invimed and&nbsp;<strong>make an appointment for a consultation with cycle monitoring<\/strong>. During the consultation, a gynaecologist specialised in supporting couples trying to have a baby will carry out a history and a vaginal ultrasound examination (cycle monitoring). <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"telemedycyna-invimed\">Invimed telemedicine<\/h2>\n\n\n\n<p>If your periods are not regular and you find it difficult to identify your fertile days, you may benefit from a teleportation as part of your first infertility consultation. Talk to your gynaecologist about what this might be due to and what tests to do to be sure about your health and fertility.&nbsp;<\/p>\n\n\n\n<p><strong>To arrange a teleportation, call: <a href=\"phone:&quot;500 900 888&quot;\">500 900 888<\/a>.<\/strong><\/p>\n\n\n\n<section class=\"cta-3\">\n\t\t<div class=\"container cta-3__container\">\n\t\t<div class=\"position-relative cta-3__wrapper\">\n\t\t            <a\n            class=\"cta-3__link\"\n            href=\"https:\/\/invimed.pl\/en\/invimed-medical-telephone-advice\/\"\n            target=\"_blank\" rel=\"noopener noreferrer\"\n            aria-label=\"cta-3\"\n            >\n            <\/a>\n                            <div class=\"acf-innerblocks-container\">\n\n<h2 class=\"wp-block-heading has-text-align-center\" id=\"skorzystaj-z-teleporad-invimed\"><strong>Take advantage of Invimed teleportation<\/strong><\/h2>\n\n\n\n<p>Consult with Invimed specialists over the phone! Our doctors and specialists provide telephone advice for your first or subsequent infertility consultation, immunological consultation, dietary or psychological consultation.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-a89b3969 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/invimed.pl\/en\/lekarze-konsultacja-psychologiczna-teleporada\/\">Find out more<\/a><\/div>\n<\/div>\n\n<\/div>\n                            <a class=\"cta-3__link cta-3__link--mobile\" href=\"https:\/\/invimed.pl\/en\/invimed-medical-telephone-advice\/\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"\">\n                            <\/a>\n        \t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"pomoz-plodnosci-dieta\">Help fertility with your diet!<\/h2>\n\n\n\n<p>Proper nutrition of the body is a very important component of good health. This also applies to fertility. Therefore, a proper diet has an impact on fertility parameters, for both men and women. At InviMed, you can benefit from dietary consultations at the clinic as well as a dietitian teleportation.&nbsp;<\/p>\n\n\n\n<p>We also encourage you to participate in free events led by Invimed nutritionists and to take advantage of free ebooks published by Invimed and created by our experienced specialists, also in the field of dietetics and dietotherapy.&nbsp;<\/p>\n\n\n\n<section class=\"cta-3\">\n\t\t<div class=\"container cta-3__container\">\n\t\t<div class=\"position-relative cta-3__wrapper\">\n\t\t            <a\n            class=\"cta-3__link\"\n            href=\"https:\/\/invimed.pl\/en\/ebooks\/\"\n            target=\"_blank\" rel=\"noopener noreferrer\"\n            aria-label=\"cta-3\"\n            >\n            <\/a>\n                            <div class=\"acf-innerblocks-container\">\n\n<h2 class=\"wp-block-heading has-text-align-center\" id=\"pobierz-darmowe-e-booki-invimed\"><strong>Download free Invimed e-books<\/strong><\/h2>\n\n\n\n<p class=\"has-text-align-center\">The e-books published by Invimed are free and freely available to the public. We dedicate them to people who are in the process of trying to have a baby - whether on their own or supported by infertility clinics. We are here for you.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-a89b3969 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/invimed.pl\/en\/free-ebook-to-download-12-christmas-eve-dishes-for-fertility\/\">Go to e-books<\/a><\/div>\n<\/div>\n\n<\/div>\n                            <a class=\"cta-3__link cta-3__link--mobile\" href=\"https:\/\/invimed.pl\/en\/ebooks\/\" target=\"_blank\" rel=\"noopener noreferrer\" aria-label=\"\">\n                            <\/a>\n        \t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"najczesciej-zadawane-pytania-faq\"><strong>Frequently asked questions - FAQ<\/strong><\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1772633908968\"><strong class=\"schema-faq-question\"><strong>Is a fertile day calculator effective with irregular cycles?<\/strong><br\/><br\/><\/strong> <p class=\"schema-faq-answer\">Fertile day calculators are less accurate with irregular cycles. In such cases, observation of ovulation symptoms, ovulation tests or professional cycle monitoring by a gynaecologist are better.<br\/><br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772633931064\"><strong class=\"schema-faq-question\"><strong>How long should one try to get pregnant before seeing a doctor?<\/strong><br\/><br\/><\/strong> <p class=\"schema-faq-answer\">Women under 35 should consult a doctor after 12 months of unsuccessful attempts. After the age of 35, it is advisable to report after just 6 months of trying.<br\/><br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772633955576\"><strong class=\"schema-faq-question\"><strong>Is it possible to get pregnant during menstruation?<\/strong><br\/><br\/><\/strong> <p class=\"schema-faq-answer\">In theory, yes, especially with short cycles. Sperm can survive in a woman's body for up to 5 days, so intercourse at the end of menstruation can lead to fertilisation with early ovulation.<br\/><br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772633980997\"><strong class=\"schema-faq-question\"><strong>What factors can postpone ovulation?<\/strong><br\/><br\/><\/strong> <p class=\"schema-faq-answer\">Ovulation can be postponed due to stress, illness, weight change, intense exercise or a change of time zone. Therefore, it is also worth observing ovulation symptoms.<br\/><br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772634007599\"><strong class=\"schema-faq-question\"><strong>Are ovulation tests always reliable?<\/strong><br\/><br\/><\/strong> <p class=\"schema-faq-answer\">Ovulation tests are not recommended for women with PCOS as they can give false positive results. In healthy women, they are effective at around 99%, but they do not predict ovulation, only detect an increase in the LH hormone.<br\/><br\/><\/p> <\/div> <\/div>\n\n\n\n\n\n<ol class=\"wp-block-list\">\n<li>Br\u0119borowicz, G. H. (ed.). (2020). Po\u0142o\u017cnictwo i ginekologia Volume 1-2 (3rd ed.). Warsaw: PZWL Wydawnictwo Lekarskie. ISBN: 978-83-200-6063-8.<\/li>\n\n\n\n<li>Wilcox, A. J., Weinberg, C. R., &amp; Baird, D. D. (1995). Timing of sexual intercourse in relation to ovulation. Effects on the probability of conception, survival of the pregnancy, and sex of the baby. New England Journal of Medicine, 333(23), 1517-1521.<\/li>\n<\/ol>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Najwa\u017cniejsze informacje Dni p\u0142odne w cyklu miesi\u0119cznym kobiety to \u2013 jak sama nazwa wskazuje \u2013 najw\u0142a\u015bciwszy moment na podj\u0119cie stara\u0144 o dziecko.&nbsp;Dni p\u0142odne i dni niep\u0142odne&nbsp;mo\u017cna wyznaczy\u0107 na kilka sposob\u00f3w, mi\u0119dzy innymi z pomoc\u0105 tak zwanego kalkulatora owulacji. Przy za\u0142o\u017ceniu, \u017ce Tw\u00f3j cykl jest regularny i trwa oko\u0142o 28 dni, pozwala on do\u015b\u0107 dok\u0142adnie okre\u015bli\u0107 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":256856,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-256852","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Kalkulator dni p\u0142odnych - oblicz dni p\u0142odne w kalendarzu - Invimed<\/title>\n<meta name=\"description\" content=\"Sprawd\u017a kiedy masz dni p\u0142odne - tylko 5 klikni\u0119\u0107 w kalkulatorze dni p\u0142odnych!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kalkulator dni p\u0142odnych - 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W takich przypadkach lepsze s\u0105 obserwacja objaw\u00f3w owulacji, testy owulacyjne lub profesjonalny monitoring cyklu u ginekologa.<br\/><br\/>","inLanguage":"en-GB"},"inLanguage":"en-GB"},{"@type":"Question","@id":"https:\/\/invimed.pl\/kalkulator-dni-plodnych#faq-question-1772633931064","position":2,"url":"https:\/\/invimed.pl\/kalkulator-dni-plodnych#faq-question-1772633931064","name":"How long should one try to get pregnant before seeing a doctor?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Kobiety poni\u017cej 35 roku \u017cycia powinny skonsultowa\u0107 si\u0119 z lekarzem po 12 miesi\u0105cach bezskutecznych stara\u0144. Po 35 roku \u017cycia warto zg\u0142osi\u0107 si\u0119 ju\u017c po 6 miesi\u0105cach pr\u00f3b.<br\/><br\/>","inLanguage":"en-GB"},"inLanguage":"en-GB"},{"@type":"Question","@id":"https:\/\/invimed.pl\/kalkulator-dni-plodnych#faq-question-1772633955576","position":3,"url":"https:\/\/invimed.pl\/kalkulator-dni-plodnych#faq-question-1772633955576","name":"Is it possible to get pregnant during menstruation?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Teoretycznie tak, szczeg\u00f3lnie przy kr\u00f3tkich cyklach. 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