How accurate are doctors at measuring how far along you are?

Question

Let’s say you could be anywhere from 10-13 weeks and doctors said you measured 13 weeks not 10. Would that be pretty accurate?
Our birth mother we are adopting from did not keep track of her periods so now I’m anxious about the due date(I have no idea why). Doctors said September 3rd (my birthday). 
This was 3 weeks ago at her first appointment so if doctors measurements are correct she would be 16 now.

Answer

They go by how big the fetus is and then determine the weeks if she can’t remember her last period.

Answer

The doctors are pretty accurate and if the baby’s measuring 3 weeks ahead of what birth Mother is saying I’d go with the doctor. The doctors measurements wouldn’t be ahead by 3 weeks.

Answer

Mine was accurate. I gave birth 2 days after my estimated due date.

Answer

That seems a little off? I’m 14 weeks and due September 15th.

Answer

If she has had a dating ultrasound done it'll be accurate, I never took much notice of when my periods were due. But when I went for my dating ultrasound I ended up measuring over a week ahead of what I thought I was and every scan after that I've measured the same x

How accurate are doctors at measuring how far along you are?

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