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Question
Hi, maybe you can help me.. Here is my situation;I had a casual sexual incounter on nov 2 2007 w a #1, then started having sex with #2(my husband now) from nov 9th on, started my period on nov 17, two days after my period was over, my husband started ejaculating inside me, and on dec 21st we found out I was pregnant. I had an transvaginal ultrasound done on jan 14, and it dated 8 weeks 3 days, crl was 1.87cm. I am about 19 weeks now. My questions are: what are the chances that #1 could be the father of my baby, what is the margin of error in transvaginal ultrasounds done at 8 weeks, and would the fetus be larger than 1.87 cm if I conceived w #1 guy. My doctor said it can't be #1s, also another expert said I conceived late nov, early dec, but I just need another opinion to be at peace, thank you for your time, it is appreciated!
Denise,
There is a 0% chance that #1 is the father. You started a new period after your encounter, which means you did not conceive that cycle. Based on the dates you gave, your probable conception date was around 12-1-07.
The standard measure of error for a transvaginal ultrasound between 8-10 weeks gestation is typically +/- 1 day. It can vary by the equipment used, but is usually only at most +/- 3 days.
And yes, the CRL of your baby would be much greater if you had conceived with #1. You'd be about a month further along if that were the case.
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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