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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Suggest Tests To Evaluate Pregnancy Weeks And Date

I have a two week window between partners. Partner #1 ejaculated in me. Partner #2 did not but we did not use a condom. I am measuring 6 weeks and 6 days pregnant. Which lines up with partner #1. If I was only 4 weeks pregnant matching P#2 could the ultrasound be off? Is there a definite difference in a 4 week fetus vs a 6 weeks 6 day fetus? Thanks
Fri, 2 Jan 2015
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OBGYN 's  Response
Hi
Ultrasound is very accurate in determining the age of pregnancy in the first trimester.

There is a definite difference in the ultrasound findings of 4 weeks pregnancy and 6 weeks 6 days pregnancy.

I hope I have answered to your satisfaction.
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Suggest Tests To Evaluate Pregnancy Weeks And Date

Hi Ultrasound is very accurate in determining the age of pregnancy in the first trimester. There is a definite difference in the ultrasound findings of 4 weeks pregnancy and 6 weeks 6 days pregnancy. I hope I have answered to your satisfaction.