Usually (all women are different) a woman has a 28 day cycle and will ovulate around day 14. If sperm can live 3-5 days, then sex between days 9-11 might result in pregnancy. If your cycle is shorter than 28 days it's possible you O earlier than day 14 - but I just can not imagine any scenario where your cycle was so short that sperm from before the cycle began lived long enough to fertilize an egg. If you have sex toward the end of your period and you have a short cycle, it's possible to get pregnant but in this case I just can't imagine any way it would be possible.
And bleeding is shedding of the uterine lining that allows an egg to implant, so if you bleed the entire contents of your lining, the pregnancy would be over anyway. Pregnancy does not occur when the sperm enter the uterus - it occurs when an egg is fertilized and implants in the lining. Once a period begins, it doesn't stop.
Last edited by Gwenn; 03-28-2013 at 12:45 AM.
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