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  2. Calendar-based contraceptive methods - Wikipedia

    en.wikipedia.org/wiki/Calendar-based...

    A woman whose menstrual cycles ranged in length from 30 to 36 days would be estimated to be infertile for the first 11 days of her cycle (30-19=11), to be fertile on days 12–25, and to resume infertility on day 26 (36-10=26). When used to avoid pregnancy, such fertility awareness-based methods have a typical-use failure rate of 25% per year. [18]

  3. These Period Tracker Apps Are The Best And Safest Ones ... - AOL

    www.aol.com/lifestyle/period-tracker-apps-best...

    Yes, period-tracker apps can sometimes be wrong, especially if you have an irregular cycle, Dr. Kudesia says. "For example, if your cycle ranges from 28 to 32 days in length, the ovulatory window ...

  4. Fertility awareness - Wikipedia

    en.wikipedia.org/wiki/Fertility_awareness

    The first day of red bleeding is considered day one of the menstrual cycle. Different systems of fertility awareness calculate the fertile period in slightly different ways, using primary fertility signs, cycle history, or both.

  5. When are you most fertile? How to find your monthly fertility ...

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  6. Irregular menstruation - Wikipedia

    en.wikipedia.org/wiki/Irregular_menstruation

    Lengths ranging between eight and 20 days are considered moderately irregular. [6] Variation of 21 days or more is considered very irregular. [6] Alternatively, a single menstruation cycle may be defined as irregular if it is less than 24 days or more than 38 days. [7] If they are regularly shorter than 21 days or longer than 36 (or 35) days ...

  7. Ovulation - Wikipedia

    en.wikipedia.org/wiki/Ovulation

    The days in which a woman is most fertile can be calculated based on the date of the last menstrual period and the length of a typical menstrual cycle. [4] The few days surrounding ovulation (from approximately days 10 to 18 of a 28-day cycle), constitute the most fertile phase.

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