If a woman has a 28 day cycle . that is she has her period every 28 days she ovulates on about the 14 th day Sperm wil survive for a bout 4 days so if she has sex on or after the tenth day after the start of her period she may fall pregnant. after ovulation the ovum will last for a couple of day before breaking up on about the 16 th day. after that the whole thing starts all over again. So You have to look at the times from the start of your period not from their finish as this can change.
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