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  2. Pregnancy rate - Wikipedia

    en.wikipedia.org/wiki/Pregnancy_rate

    The time with the highest likelihood of pregnancy resulting from sexual intercourse covers the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. [10] In a 28‑day cycle with a 14‑day luteal phase, this corresponds to the second and the beginning of the third week.

  3. Calendar-based contraceptive methods - Wikipedia

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

    In the 1920s, Kyusaku Ogino, a Japanese gynecologist, and Hermann Knaus, from Austria, working independently, each made the discovery that ovulation occurs about fourteen days before the next menstrual period. [13] Ogino used his discovery to develop a formula for use in aiding infertile women to time intercourse to achieve pregnancy.

  4. Age and female fertility - Wikipedia

    en.wikipedia.org/wiki/Age_and_female_fertility

    The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]

  5. Here's How To Tell If Spotting Before Your Period Is No ... - AOL

    www.aol.com/youre-spotting-period-might-dealing...

    If you see spotting the week before your period typically comes but then don’t get a full-fledged period soon after, you should consider taking a pregnancy test. 3. You have a hormone imbalance.

  6. Wait, Can You Get Pregnant from Precum? - AOL

    www.aol.com/wait-pregnant-precum-174700827.html

    Bhuyan estimates that there is around a 14 to 24 percent chance that you can get pregnant from precum, even if you do pull out. How can you prevent precum from causing an unwanted pregnancy?

  7. Human reproduction - Wikipedia

    en.wikipedia.org/wiki/Human_reproduction

    Chance of fertilization by menstrual cycle day relative to ovulation [14] Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. [15] For optimal pregnancy chance, there are recommendations of sexual intercourse every 1 or 2 days, [16] or every 2 or 3 days. [17]