Go from last period: Was that ultrasound done in the first trimester. That's when you can most accurately date a pregnancy. You obviously cannot conceive before having sex so the second date is out but that is assuming your calculations are correct. It would be also very unlikely to conceive 9 days after having sex.
Answered 2/26/2014
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3 doctors weighed in across 2 answers
A doctor has provided 1 answer
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