8 weeks (according to lmp) but sonogram measures 5 weeks

Magallyta · April 2016

hi everyone, just looking for comfort, advice or just venting. According to my lmp I should be 8 weeks but 1st sonogram measures @5. My doc (which I plan to switch) was not sympathetic at all. I understand what the outcome can be. However, I also know there could be a good ending. We took a blood test & my levels are 33,000 which doc thinks is an advanced pregnancy. I questioned if I was actually 8 weeks- maybe I ovulated later. Though I understand 3 weeks is a bigger gap to be incorrect- but a possibility! I am getting a 2nd opinion as my doc said after next sonogram she wants to schedule d&c if no change in growth.

rspalding001 · April 2016

I'm so sorry you are going through this. You are right in that without knowing when you ovulated you could easily be off by a number of weeks. Some things you can ask yourself are:
1) Do you normally have a regular 28 day cycle? If not you can't assume you ovulated on CD 14 which is what is assumed when basing your due date off of LMP.
2) When did you get your BFP? The absolute earliest you can get a BFP is 9 DPO (and that would be a very faint positive). That being said some people wont see their first BFP until 14 DPO, so there is wiggle room there as well. You can assume that you are technically 2 weeks pregnant at the time you ovulated, so depending on when you got you BFP you would be anywhere from 2 +9 to 4 weeks pregnant, maybe even further along if you weren't looking for it and didn't test until later.

I dont know enough about HCG to know what to expect with 33,000 but try not to worry too much until you have another scan. The scan is really the only way t o know at this point since it will measure growth between now and then. I hope you can get your answers soon!
Fingers crossed!

Magallyta · April 2016

Hi thank you for responding back. Here are my responses;

1)my cycle is generally 26-28 from what I know.

2) bfp: March 23 ( last day I could get my period as per tracker)

rspalding001 · April 2016

So I am in no way a Dr or qualified to give any kind of real advice, but the way I calculate it is with a BFP on March 23 you can assume you ovulated on 3/14 (9 days earlier) at the latest which would put you at 7 weeks as of this Monday (4/18). Im so sorry and I hope that I am wrong. I'm just basing this on my own research as I went through 3 losses last year so I did a lot of googeling on it. Id still wait for the next scan to be sure. I can tell you that on my current BMB there is a woman who was told she was having a MC and then at her next scan the baby had caught up AND had a strong heart beat, so sometimes these ultrasound machines are not perfect and can be off by as much as a week. My fingers are crossed for you!

Magallyta · April 2016

Thank you I am preparing for both outcomes as it is in the hands of God now.

MollySm · April 2016

I'm sorry you are going through this. LMP is not really an accurate way to determine when you ovulated, which is why many doctors are doing these early ultrasounds. Unfortunately, the only real way to know anything now is to wait a week and see if baby grew.

I have had a miscarriage before, and I know the wait is excruciating. I have also had a happy growing baby a week after seeing a difficult ultrasound. It is normal for doctors to use one week as the time frame to know if things are progressing. But if you aren't comfortable with a D&C, it's likely there is no reason to have one, especially not right away. With my miscarriage I felt more comfortable waiting, and eventually my body miscarried on it's own. I would find a doctor you are comfortable with, and make sure you let them know what you want.

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8 weeks (according to lmp) but sonogram measures 5 weeks

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