I need some help with my date of conception. My LMP was 12/25/09. It was a normal period, no spotting, moderate-heavy flow and lasted 5-6 days. I was given a due date of 9/23/10 from an ultrasound that was done at 10 weeks, 3 days. I know this puts conception around 12/31, but I also had intercourse the day before my period started, on 12/24/09. Could sex on that day have gotten me pregnant? Could the sperm have stayed long enough to fertilize the egg at ovulation?
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replied July 2nd, 2010
Especially eHealthy
No Ash, You are infertile the week before your period starts. Unless something very big is wrong in that cucle, you ovulated between 12 and 16 days before your period. His sperm was dead before you finished your period.

At 10 weeks the ultrasound can be off by about 3 days.

Unfortunately you do not say but did you have sex while on your period? If not, the 24th is the only explanation but it will be unusual (not impossible).

Best of luck!
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replied July 2nd, 2010
I had sex at the tail end of my period, on 12/30 and 1/1. By 1/1, though, it was over. Other than that, 12/24 was the only time I had intercourse. I didn't know if sperm could last that long during menstruation. Thanks!
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replied July 2nd, 2010
Especially eHealthy
That will explain it then. I would say that there is almost zero chance that you got pregnant before your period.. It happened on 12/30 or 1/1.

Sperm move amazingly quick. In about 5 minutes it is in the fallopian tubes, looking for an egg. If you have an orgasm shortly after he ejaculated, this shrinks to about 30 seconds. Once the sperm is there, your period is immaterial to it. Your hormonal state is however such that you will not ovulate while you are menstruating. That is just the way your cycle works, During your period sperm have a much tougher time, swimming upstream aginst the menstrual debris flow and through the carnage in your uterus.

Take care.
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