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My ex got pregnant, we had sex on the 12/3/2016 she was at the end of her period, we broke up and a week later on 12/12/2016 had sex with another man, she got a ultrasound on 2/8/2017 Doctor said she was 10 weeks pregnant, she's 13 weeks pregnant now 3/3/2017 , she says the doctors calculate from her last period she says she conceived on December 12. She say it can't be mine My question is, is there any chance it could be mine? 

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Hi Pendalfolus,

13 weeks as of the 3rd means her last period started about December 2.

If so, you had sex very early in her cycle, day 1 or 2.  Sperm can survive up to about 5 days max.  She wouldn't be expected to ovulate until between days 11-16 of her cycle.

The 12th of December would be day 10 or so.  That would be at/near her peak fertility.

It's the other guys baby - almost 100% certainty.

 

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December 3rd when we had sex her period ended she was just spotting though, the doctor told her the baby was 10 weeks developed February 8, 2017.
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Ultrasound dating can vary.

When did her period start? Likely 4-5 days before you had sex. So you then had sex on days 5 or 6. It's still early. Still most likely the other guy.

You'll need a DNA test to confirm.
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