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  2. 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.

  3. Estimated date of delivery - Wikipedia

    en.wikipedia.org/wiki/Estimated_date_of_delivery

    281 days after LMP for first-time mothers and 280 days for all others were the medians found by a 1995 American study of 1,970 spontaneous births. Standard deviation was 7–9 days. [17] [18] 282 days after LMP was recommended for cases where LMP is the only known factor, in a study of 17,450 patients combining LMP and ultrasound measurement ...

  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. Fertility experts say that getting pregnant after age 45 is ...

    www.aol.com/lifestyle/fertility-experts-getting...

    "It is best to ensure that any pre-existing medical conditions be adequately controlled before attempting pregnancy." It's not just celebrities that are having babies in their mid- and late 40s.

  6. How long does it take to get pregnant? - AOL

    www.aol.com/lifestyle/nearly-60-women-wish-knew...

    Most couples don’t get pregnant when they first try to conceive and that is normal, experts explain. Nearly 60% of women say they wish they knew how long it would take to get pregnant before ...

  7. 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.

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