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  2. Ovulation - Wikipedia

    The time from the beginning of the last menstrual period (LMP) until ovulation is, on average, 14.6 days, but with substantial variation among females and between cycles in any single female, with an overall 95% prediction interval of 8.2 to 20.5 days.

  3. The most common birth control methods and how effective they ...

    The Pill uses the hormones progestin and estrogen to prevent ovulation, Minkin explains, so no egg is released. "You don't get pregnant without an egg out there," she says. However, there is also ...

  4. Ovule - Wikipedia

    Ovule orientation may be anatropous, such that when inverted the micropyle faces the placenta (this is the most common ovule orientation in flowering plants), amphitropous, campylotropous, or orthotropous (anatropous are common and micropyle is in downward position and chalazal end in on the upper position hence, in amphitropous the anatropous arrangement is tilted 90 degrees and in ...

  5. Age and female fertility - Wikipedia

    (May 2022) Female fertility is affected by age and is a major fertility factor for women. A woman's fertility peaks between the late teens and late-20s, [1] after which it starts to decline slowly. While many sources suggest a more dramatic drop at around 35, [2] this is unclear since few studies have been conducted since the nineteenth century.

  6. Menstrual cycle - Wikipedia

    Menstrual cycle. The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that make pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone.

  7. Fertility awareness - Wikipedia

    In the 1920s, Kyusaku Ogino, a Japanese gynecologist, and Hermann Knaus, from Austria, independently discovered that ovulation occurs about fourteen days before the next menstrual period. Ogino used his discovery to develop a formula for use in aiding infertile women to time intercourse to achieve pregnancy.

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