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First Trimester Dating Ultrasound...?

By July 16, 2012 - 8:29pm
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Hello. I am currently 35 weeks 1 day pregnant with my first child. I have been reading numerous books (What to Expect..., etc.) and I have noticed that I am experiencing things that would typically happen later in a pregnancy, but I find it really hard to believe that I am further along. I had a regular menstrual period on October 17th, then tried to conceive with my husband after that, took a pregnancy test a few days before my period in November (it was negative) and then my period came on November 14th, 2011, and it was a normal (heavy) flow with lots of clotting that lasted about 5/6 days. We tried to conceive again after my period and learned we were pregnant on December 14th, a few days after my period was expected. With all of this information, including the first-trimester dating ultrasound saying that I was roughly 6 weeks along (I had it at 8 weeks on January 5th, 2012), would it be at all possible for me to have gotten pregnant in October? All of my measurements correlate with my "pregnancy week" when they measure my belly, but now I am concerned that I may be 40 weeks along instead of 35 weeks and the doctors may not have realized it. So, based upon my periods being regular and the first trimester ultrasound, is it safe to say that I conceived AFTER November 14th? My ovulation time would have been between November 24th-December 2nd.

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HERWriter Guide

Hi DCones12

Thanks for your post!

We cannot tell anyone their date of conception (you'd know that, rather than us! :) ) but based on your dates and information, what your doctor is saying seems accurate.

Don't read too much about "where you should be" in all these books although I know they are interesting to read. Remember they are a rough guide only. I didn't feel kicks until a month after I was supposed to feel them and my "about 7.5 lbs baby" was 9lbs 7oz!

Since you had a full period in Novemeber, you would not have gotten pregnant in October.

But call your doctor if you are still concerned.


July 17, 2012 - 5:38am

I'm sorry, I think I rambled a bit more than I actually gave information! Anyway, at my January 5th, 2012 ultrasound (the dating one, which was transvaginal) it says the length of the baby was 16 mm...and I believe I was roughly 8 weeks along, would that correlate? Can a first-trimester dating ultrasound done at 6-8 weeks be off by more than 1-2 weeks? This isn't an estimated date of delivery issue, because I know that babies come whenever THEY are ready LOL, this is more of a "When did I conceive" question. Thank you for taking the time to read this, I know it is a lot of information (and rambling)!

July 16, 2012 - 9:01pm
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