I had unprotected sex with a woman the 29th to 30th August night, only one night. I know that she had sex with others more that 10 days later after me, she said that protected (I'm not sure of this). The echography of the 30th of November said that she is pregnant of 12 weeks plus 4 days (CRL: 62mm, OFD: 27mm), the doctors says her that the due date will be the 10 of June 2010. She has 41 years and her last period was in July, I think that she has irregular period or premenopause.

According to the 30th November echography, she is pregnant of 12 weeks plus 4 days (menstrual age according to the measurements), her conception date must to be two weeks later, 10 weeks plus 4 days since 30th November (17th September), (and the 29th to 30th August night would be the 13 weeks plus 1 day counting since 30th November).

There is 19 days between 30th August (the day that I was with her) and 17th September (the conception date that echography says).

The baby will be a boy.

I want to know if is possible that I was the father.

Thanks.
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replied January 31st, 2010
Experienced User
it is less likely to be you,however, it would not be the first time a medical device used to calculate the conception date was wrong. If the baby is born early I would definately get a paternity test. I probably would anyway b/c I may not trust her.
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Users who thank sooz0503 for this post: Creative5 

replied January 31st, 2010
Especially eHealthy
Creative5, That due date place the conception date around Sept 17. This means sex between around Sept 13 to Sept 18 could get her pregnant. This dates can be off by up to 5 days either way, 3 days for inaccuracies in the scan dating and 2 days variance in ovulation. There is no way that sperm could have survived from August to then.
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Users who thank UnknownABC for this post: Creative5