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Knowing the days you are most likely to be fertile can increase your chance of getting pregnant. The typical menstrual cycle is 28 days long, but each woman is different. There are about 6 days during each menstrual cycle when you can get pregnant. This is called your fertile window. Use the calculator to see which days you are most likely to be fertile.

Before you can use the calendar method as birth control, you need to keep track of the length of your menstrual cycles for at least 6 periods. You can do this with a regular calendar or our period tracking app.

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Keep in mind that many factors, including medications, stress and illness, can affect the exact timing of ovulation. Using the rhythm method to predict ovulation can be inaccurate, especially if your cycle is irregular.

Menstruation is the technical term for getting your period. About once a month, females who have gone through puberty will experience menstrual bleeding. This happens because the lining of the uterus has prepared itself for a possible pregnancy by becoming thicker and richer in blood vessels. If pregnancy does not occur, this thickened lining is shed, accompanied by bleeding. Bleeding usually lasts for 3-8 days. For most women, menstruation happens in a fairly regular, predictable pattern. The length of time from the first day of one period to the first day of the next period normally ranges from 21-35 days.

Beyond simple calendar tracking, there are a few ways to figure out the timing of your own personal menstrual cycle. Separately or used together, these can be used to help determine when and whether you are ovulating. Three methods you can try are cervical mucus testing, basal body temperature monitoring, and ovulation prediction kits.

You start with the menstrual cycle (your period, when the lining of your uterus sheds), followed by the follicular phase (when the follicles in your ovaries mature and get ready for the prime time: ovulation), then comes ovulation (when the egg is released), followed finally by the luteal phase (when the egg makes its way down your fallopian tubes and gets ready to bleed). Knowing this, you can track your period and your cycle.

You can also use a period tracker for way more than just predicting bleed week. Since ovulation usually occurs on the 14th day of your cycle (with Day 1 of your cycle being the first day you bleed), you can also learn and track peak ovulation.

Methods: Seventy-three women completed a menstrual history questionnaire and submitted to blood sampling for the first 6 days of menses and 8 to 10 days after a positive ovulation test over 2 consecutive months. Frequency counts determined whether appropriate criterion hormone (progesterone) levels were achieved at predefined calendar days.

Results: For the criterion of progesterone >2 ng/mL, 18% and 59% of women attained it when counting forward 10 to 14 days after the onset of menses and counting back 12 to 14 days from the end of the cycle, respectively. Most women (76%) attained the criterion for ovulation 1 to 3 days after a positive urinary ovulation test. Regardless of the counting method employed, the criterion of progesterone >4.5 ng/mL for identifying midluteal phase was attained in 67% of cases. Serial blood sampling for 3 to 5 days after the positive urinary ovulation test captured 68% to 81% of the hormone values indicative of ovulation and 58% to 75% indicative of the luteal phase.

Conclusion: These data suggest that self-reported menstrual history and calendar-based counting methods should not be used alone if accurate identification of ovulation is essential. A urinary ovulation test and serial blood samples for verification of progesterone postovulation enhance the proper identification of menstrual cycle events.

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The menstrual cycle is a series of changes that occur in a woman's body as part of the preparation for the possibility of pregnancy occurring. It is a cycle that usually begins between 12 and 15 years of age that continues up until menopause, which, on average, occurs at the age of 52. The menstrual cycle is typically counted from the first day of one period to the first day of the next. It is controlled by the rise and fall of hormones. The length of a woman's menstrual cycle varies. A regular menstrual cycle is considered to be a menstrual cycle where the longest and shortest cycles vary by less than 8 days. The average menstrual cycle lasts 28 days.

As part of the menstrual cycle, the lining of the uterus thickens, and an egg, which is required for pregnancy to occur, is produced. The egg is released from the ovaries in a process called ovulation, which corresponds with the time during which a woman is most fertile (~5 days before ovulation, up through 1-2 days after ovulation). If the egg is not fertilized, pregnancy cannot happen, and the lining of the uterus will shed during a menstrual period, after which the cycle restarts.

A period, a commonly used term for referring to menstruation, is a woman's regular discharge of blood and mucosal tissue that occurs as part of the menstrual cycle. Bleeding and discharge of the mucosal lining of the uterus, through the vagina, usually lasts between 2 and 7 days. It occurs in the early phases of the menstrual cycle, referred to as the menstrual phase, which begins when the egg from a previous cycle is not fertilized. Periods stop during pregnancy, and typically do not resume during the early stages of breastfeeding. Periods also eventually stop permanently during menopause, usually between the ages of 49 and 52, and can be defined as having no vaginal bleeding for a year.

The Period Calculator estimates period days and the most probable ovulation days in calendar form. Period days are the days during which bleeding and discharge occur. The most probable ovulation days are the days during which a woman is most likely to ovulate.

Since a positive urinary ovulation test is used as a positive indicator of ovulation in the absence of sequential progesterone values, the calendar-based counting methods for capturing ovulation were compared to the urinary ovulation test. When counting 10 to 14 days forward from the first day of menses to determine ovulation, only 35% and 42% of women had a positive urinary ovulation test between days 10 and 14 after menses in cycles 1 and 2, respectively. Counting back 12 to 14 days from the start date of the next cycle to capture ovulation, only 32% and 23% of women had a positive urinary ovulation test during this window for cycles 1 and 2, respectively (Figure 1). The mean day of ovulation counted from the onset of menses was 15 for cycle 1 and 16 for cycle 2.

Frequency distribution for the menstrual cycle day that ovulation occurred, as counted from the onset of menses in cycle 1 and cycle 2 for each participant. All women who did not ovulate by day 25 are included in the 26+ category.

When the criterion serum progesterone level of >2.0 ng/mL was applied as the indicator that ovulation had occurred during cycle 1, only 18% of women attained this value during the 10 to 14 days after the onset of menses (Table 2). Interestingly, 71% of women did not have a positive urinary ovulation test until >14 days after the onset of menses in cycle 1. When the generalized method of counting back 12 to 14 days from the onset of menses in cycle 2 was utilized, 59% of women attained the 2.0 ng/mL level of progesterone in this window, and only 29% of the women had completed all of their luteal phase hormone collection prior to the end of this window. Finally, during the 1 to 3 days after the positive urinary ovulation test, 76% of women attained the serum progesterone level of 2.0 ng/mL.

The mean number of days to attain >2.0 ng/mL of progesterone during this postovulation sampling window was 2 days for cycles 1 and 2 (Figure 2). Further analysis revealed that serial blood sampling for a minimum of 3 days after the positive urinary ovulation test would have captured the attainment of this criterion progesterone level in 76% of participants in cycle 1 and 68% in cycle 2, while sampling for an additional 2 days (5 days total) would have captured 81% in cycle 1 and 76% in cycle 2. Women never attaining the criterion during the 10-day postovulation sampling window are included in the 11+ category (10% of women in cycle 1 and 14% of women in cycle 2).

Distribution of the number of days after the positive urinary ovulation test required to reach the criterion progesterone level for ovulation of >2.0 ng/mL for each participant in cycle 1 and cycle 2. All women who did not reach the criterion by 10 days after the positive urinary ovulation test are included in the 11+ category.

In the attempt to capture the midluteal phase in cycle 1 by counting 7 days forward from the assumed 5-day ovulation window (days 10-14), 67% of women reached a criterion progesterone level >4.5 ng/mL, indicating a luteal phase hormonal milieu (Table 3). However, 25% did not reach this progesterone level during this window, and 8% of women actually had luteal days that started after day 21 (ie, a positive ovulation test did not occur until after day 21). Similarly, utilizing the generalized method of counting back 7 to 9 days from the start of the next menstrual cycle to identify the previous luteal phase, 67% of women reached a progesterone level >4.5 ng/mL during this window. A total of 8% of women did not reach this level during the window, and 25% of women had finished their luteal days before the window (ie, a positive ovulation test occurred early, and 8-10 days of blood collection was completed before the 9-day-back threshold). Finally, using the method of counting 7 to 9 days forward from a positive urinary ovulation test, 67% of women reached a progesterone level >4.5 ng/mL during this window, while 32% did not. ff782bc1db