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Anonymous
a woman is most fertile around the time that she's ovulating. the time this happens varies widely by the individual. in physiology textbooks this happens some time on day 13-15, where day 1 is the first day of menstruation. she's not only fertile on that day, but a few days before and a couple days after. sperm can live inside a woman for a couple days so you can take your calculations from there.
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