Do you trust dating U/S?

welly01 · September 2014

I know I've seen one person that already said they were going to lie about their LMP because they know when they ovulated. There are also several of us who have no idea when we actually ovulated.

With DS, I think the dating US was 3 days off from my LMP, so we kept the dates. With this one, I'll be trying for a VBAC. Induction is the very last thing that I want and I'm not even sure the doctor will allow it, so every day will count. I never showed signs of even being close to labor with DS at 40 weeks and even 2 days on pitocin.

How do you feel about lying about your LMP to give yourself a few extra days? Do you think dating US's are really accurate and should be trusted?

mpiemont · September 2014

I don't think you should lie about LMP unless you are pretty dang sure you know when you ovulated (using OPKs, temping, tracking CM etc) Otherwise, lying about LMP could just be a shot in the dark. As far as dating US, I think they have a +/- 5 day error range so they might not be completely exact, but a far as I have learned from my prior pregnancies, they are the most accurate measurement of how far along your pregnancy is. Your situation is unique as far as wanting a VBAC so I would jut discuss these concerns with your OB from day 1 when your due date is established.

SnowFlake84 · September 2014

I wouldn't lie,but if you do know your ovulation date, a good ob will go from that. I ovulated on CD17, so going from LMP is inaccurate. My RE will look at my IUI date and the ultrasound together to determine my EDD. Are your cycles regular? If so, subtract 14 from the length of your average cycle and that's a good estimate of your O date, unless you were on fertility drugs. But i would just share my concerns with the doc if i were you. Hopefully they'll help you out with determining an accurate date.

mpiemont · September 2014

Oh and to add- at 40w I didn't show signs of labor with either of my boys and they were born 2 and 3 days later, respectively, and both without any induction at all.

welly01 · September 2014

I wasn't charting or anything, just tracking my periods. I probably didn't even write down which day I had EWCM. I guess I will go by what the US said and just hop this pregnancy turns out differently.

xcjump · September 2014

If the dating ultrasound gives you more time, I would go with that date, even if it is a few more days. I would keep whichever date gives you a little more time, but I wouldn't lie.

Pink724 · September 2014

@Starbuck128‌ - thank you for articulating what I was thinking in my head. Completely agree.

icajesica82 · September 2014

With my daughter my 20 week u/s dated her being 4 days ahead but they have a 5 day clearance, so if it dates 5 days in either direction they won't change the date. I wouldn't lie unless you are exactly sure when you O'd.

icajesica82 · September 2014

and you have the right to refuse and induction. So if they did want to based on the time, you could refuse. My friend was 14 days over due and they wanted to induce, she asked to wait over the weekend. She went on her own the next day.

welly01 · September 2014

icajesica82 said:

and you have the right to refuse and induction. So if they did want to based on the time, you could refuse. My friend was 14 days over due and they wanted to induce, she asked to wait over the weekend. She went on her own the next day.

I definitely know I can refuse an induction. But with a VBAC, I'm not sure I want to go over 42 weeks anyway.

MAdams728 · September 2014

I wouldn't lie about my LMP. Not a good idea. Dating ultrasounds, measurements and fetal development are pretty accurate.

I would make sure to voice your concerns to your OB.

welly01 · September 2014

Starbuck128 said:

welly336 said:

icajesica82 said:

and you have the right to refuse and induction. So if they did want to based on the time, you could refuse. My friend was 14 days over due and they wanted to induce, she asked to wait over the weekend. She went on her own the next day.

I definitely know I can refuse an induction. But with a VBAC, I'm not sure I want to go over 42 weeks anyway.

Have you had your first appointment? I didn't think your situation all the way through before replying, but now I get why you are worried. I hope everything works out for you.

Thanks. I absolutely trust my OB and believe she's my best, most reasonable shot at a VBAC. My only concern is I think her limit is 41 weeks, while mine might be 42 weeks. I haven't had my first appointment, but I discussed my VBAC with her in my post-natal appts with DS and had a checkup with her earlier this year and discussed it again with her. If I truly want to go to 42 weeks, I think I could get her to agree to daily stress tests or something.

I think I will just have to trust the US and hope this baby doesn't wait until 42 weeks.

mpiemont · September 2014

@starbuck128 I was told that as well. And that I should expect labor with #2 to be roughly half the time as #1. Well #2 came later than #1 AND labor was longer. The body is a mystery.
:-?

icajesica82 · September 2014

Thinking about it a little bit more I feel like even with an early dating if they did the ultrasound later on and the date was way off they would still change it so I don't think lying will change the end result? Hope that makes sense. I know my friend had a dating u/s early on and it said one thing but then they changed it later around 20 weeks I think because it was saying something significantly different than the first to change. I think it was 5 days from the first.

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