Dating scan does not match lmp

Is it possible baby is just growing quickly and it's irrelevant when I ovulated?

LMP and Ultrasound dates not matching

Anyway, I asked her which we go with, ovulation date or foetus size and she said it really doesn't matter, we can just pick either date but we must stick with it. Anyone else have this happen?

I was given three different due dates, all within a week of each each. I don't think 4 days should make much difference to how your pregnancy is managed. When measuring at such an early gestation 0. My pregnancies are ivf so I know exactly what dates I'm dur but I still get asked at every single scan when my LMP was.

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Try not to worry. Both were very healthy and i know when i ovulated also. I wouldn't be concerned about the few days difference. I ovulate late day 22 usually and have small babies so whenever I've had scans they try and change my dates up to 2 weeks from LMP. Thanks everyone for your input! Sometimes we do use a trimester system if we are seeking to describe how far along a woman is in general terms. Trimesters, however, have a variability of a few weeks, so they should be thought of as general benchmarks. The first trimester is generally considered to comprise the time up to 12 or 14 weeks from the LMP.

The second trimester extends from the end of the first until about 26 to 28 weeks from the LMP, and the third trimester from the end of the second until delivery.

Last menstrual period not matching up to due date

Ultrasound can be used to date pregnancies, especially when the LMP is not known for example, pregnancy after a delivery but before a menses occurred or irregular menses without predictable ovulation. Ultrasound dating is based on a series of measurements of the gestational sac in very early pregnancies and of the embryo or fetus itself as pregnancy progresses.

However, unless there is a great difference between what is seen on an ultrasound and what was reported as LMP, doctors still use LMP to establish a due date. For example, if in the first trimester the ultrasound estimate falls within one week of the LMP estimate, we still use LMP to determine due date and length of pregnancy. If the ultrasound estimate differs by more than one week from the LMP, we would use the ultrasound estimate for the due date. This method continues in the subsequent trimesters.


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In the second trimester, the determination also defaults to the LMP unless the ultrasound estimate is more than two weeks different from the LMP. We follow the same process in the third trimester, with a three-week difference.

Re: Do your dates and your dating scan dates match?

Pregnancies can also be dated with a physical exam. Essentially I would be only 3 days overdue by my dates when hospital policy would kick in and they'd want to induce me.

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I know it might not happen but considering how many people go over on their first baby I'd like to have the option to hold off longer than just three days. I've since been told that dating scans are more accurate when done between weeks 9 and 13! I had early scans both times and the gestation matched my dates. The anomaly scan also matched the dates so my consultant was happy to go by my dates, which was important to me as I ended up with sections both times due to dates, along with other factors. Yeah, I heard they're more accurate before 12 weeks for dating.

I'm sure of my dates too and my scans have matched pretty closely. Fundal height has always been bang on too, even though I feel huge and people tell me I'm big. Remember with induction, you would need to agree to it before they could do it.

Can ultrasound aid in calculation of LMP if patient does not remeber it?-Dr. Teena S Thomas

They can't force you into it if you're confident in your dates. They can advise you but at the end of the day, its your body and your baby. If you only know the date of your lmp I would be inclined to stick with your scan dates.


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Congrats on your pregnancy by the way! My dates tied up with scan dates. I don't have a 28day cycle but knew when I ovulated and I had calculated my date based off that. Consultant was expecting me to be a week further along based off a 28day cycle but was happy when I agreed with his estimation based off scan.