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I girl I was with had an ultrasound that dated her LMP at 7w3d, I was with her 8w2d ago and used the extraction method. She started seeing someone at most a week after me and was with him multiple times. Is it possible/probable that the baby is mine?
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First trimester ultrasounds date a pregnancy to within a few days. Your last encounter with her was a week before her last period and three weeks before the ovulation at which she got pregnant. It could not be responsible for the pregnancy.
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Half a mo'. That a__sumes that the two time intervals you give are effective the same date. For instance, if the ultrasound gave an LMP of Sep 22 and you were with her Sep 16, then you are not responsible.
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