Actually, it's 11 to 18 days, and sperm can live in the vagina for up to 5 days. (My wife is catholic, and we tried this for a while. She finally gave in and we use condoms now.) It can vary from woman to woman though. It can also change based on stress, diet, and a bunch of other things. They now make fertility monitors that are based on a lot of information gathering, day the period started, her temperture, etc. They run about $200. They are supposed to be pretty accurate though.
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Originally posted by smithja0423
The way i understand it, a woman is most fertile around 7-14 days after the START of her period, so if she starts, and bleeds for four days, you've got three more days that are "safer" than others, and the the days after day 14 as well. There's little chance of impregnating a woman just a few days before her period.
BUT - this isn't the 1950's teachings of the Catholic church. Get with it! You shouldn't be having unprotected sex anyways, unless you're intending to procreate or are prepared to deal with the consequences of an unplanned pregnancy.
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