Probably boyfriend: Sperm can live in a woman's reproductive tract for 7 days. Medical studies have shown that a woman can ovulate at any time during the month, including during her period. This is a rare occurence, but the only way to know for sure is to do a paternity test.
Answered 3/19/2015
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Probably boyfriend: Since the sperm only live about 3 days it is most likely not your ex assuming conception date was actually 5/6-5/10, however conception dates are not exact and may depend on cycle length and when ovulation actually occurs. Paternity tests may be needed but talk with your doctor.
Answered 10/16/2012
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