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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]
The Standard Days Method identifies days 8-19 of cycle for women with cycles between 26 and 32 days long, as the potential fertile window. This formula is based on computer analysis of 7,500 menstrual cycles and takes into account cycle length, the timing of ovulation, the variation of the timing of ovulation from one cycle to the next, as well ...
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.
Or, a calendar rule may require calculation, for example holding that the length of the pre-ovulatory infertile phase is equal to the length of a woman's shortest cycle minus 21 days. [32] Rather than being tied to cycle length, a calendar rule may be determined from the cycle day on which a woman observes a thermal shift. One system has the ...
The possibility of pregnancy from sperm survival longer than five days has been compared to "the chances of winning a huge lottery." [4] Menstruation will occur about 2 weeks after ovulation. A ten-year study of 45,280 subfertile couples in China found that 32.1% of women were able to achieve pregnancy and live birth through the use of Billings ...
In women who have regular menstrual cycles, the fertile window occurs at approximately the same time every month. If the first day of menses is considered day 1, then ovulation occurs around day 14. In regular cycles that are 26–32 days long, the fertile window occurs on days 8–19. [9]