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Why do LMP and ultrasound dates not match?

Why do LMP and ultrasound dates not match?

An ultrasound is actually the most accurate way to date a pregnancy because all fetuses grow at a consistent rate during the first trimester and early second. In other words, if your baby measures 9 weeks 2 days when you have your ultrasound, that’s how far along you are, no matter when your last period was.

Which due date is more accurate LMP or ultrasound?

Because few women know the exact day they ovulated or conceived, an ultrasound done in the first trimester of pregnancy has been shown to the be the most accurate way to date a pregnancy. If an ultrasound date in the first trimester differs from your LMP date by seven days or more, we would go with the ultrasound.

Can my due date be wrong based on my last period?

Every pregnant woman wants to know her due date. But a due date calculated from last menstrual period with a due date calculator often doesn’t match the due date that is estimated by ultrasound (also known as a sonogram).

Does 2 weeks pregnant mean 4 weeks?

Remember, your health care provider calculates your due date and the 40-week countdown from the first day of your last period. So, if you just had a positive pregnancy test and think you’ve been pregnant for two weeks, then you’d actually be at week 4.

Why was my ultrasound date not matching LMP date?

With my last pregnancy my lmp date was different to my ultrasound date by nearly 3 weeks my doctor said they go of your cycle being around 28 days some women have shorter cycles others longer thats why my dates didnt match i have a longer cycle.My ultrasound date was the correct one and i had a beautiful girl. I am a googler too!

Is the due date different from the LMP date?

My LMP gave me edd as 23rd of March 2013 but scan showed 4th of April. Im now 22weeks 5days and due date has been set for 4th April. I was just as worried as you when I got told the difference in dates. Its normal, dont worry too much. HCG results can vary as well, the best indication is the earliest scan.

How old should I be according to my LMP?

Last week I went in for my first ultrasound, and according to my LMP I should have been 7 weeks and 2 days into my pregnancy. However, I was very concerned when the technician told us the baby was only measuring at 5 weeks and 3 days, and there was no detectable heartbeat yet.

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