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Childbirth/Ultrasound conception date accuracy
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Question
Hello. I was with my girlfriend on march 14th, she was with her ex on the 23rd. she is pregnant. she had an ultrasound done within the first trimester, I believe 6-9 weeks in, and the given conception date was march 20th. From what Ive read conception date accuracy if done within the first trimester is very accurate. the doctors she saw said that the date was accurate within 1-2 days. is this so? could she have gotten pregnant on the 23rd? There will be a paternity test no doubt, I would just like to know what your thoughts are about ultrasound conception dates and who do you think is more likely the father.
Adam,
You're correct that early ultrasound is quite accurate, typically within +/- 3 days (it depends upon the equipment used & the skill of the technician).
So it's still entirely possible that she conceived on the 23rd. If I had to pick, I'd say you were much more likely to be the father.
Best,
Catherine
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Answers by Expert:
Catherine Beier MS CBE
Expertise
I can provide evidence-based information and current research findings concerning childbirth and pregnancy. My specializations include natural childbirth, pregnancy and birth interventions, fetal positioning, labor induction, choosing a care provider, midwives, homebirth, unassisted birth, natural pain relief, medications in pregnancy and birth, informed consent, understanding the risks and benefits of childbirth choices, doulas, waterbirth, childbirth methods, childbirth education classes, cesarean section, and VBAC.
Experience
I have been a childbirth educator, mother, author, public speaker, researcher, and birth advocate for the past 9 years. I am also the author of Giving Birth Naturally, a site dedicated to natural childbirth and pregnancy information. I publish evidence-based articles on pregnancy, childbirth, newborn care, and post-partum care. I'm also a mother of three children, two daughters and one son all born naturally. To learn more about what normal birth looks like, view the natural childbirth video of my son being born at home unassisted.
Publications
My book, Birth Outside the Box, was published in 2007.
Education/Credentials
I hold a Master's degree in communication disorders with an emphasis in child development. I am also an independent childbirth educator.
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