same with me going off period due date is 9-22 but off ultrasound 10-1 Dr hadn't changed due date but in 3 weeks I go back for another ultrasound and they will measure the baby

they went off of my last period and they got September 27th. Then when I went for my first ultrasound, they said that my due date is September 20th. So I'm not sure which one is more accurate.

Yes I was way further than I according to my lmp I was supposed to be 8 weeks pregnant but when my ultrasound was done I turned out to be 12 weeks pregnant

that's what happened to me but my doctor left it the same since it was only 3 days difference.

most doctors will go off of the ultrasound, but if it isn't that far off they won't change it, since a due date can be off by 2 weeks anyways. so if she didn't say it changed, then go off of the other. I've always measured ahead and they don't change it unless its a big difference usually.

@mommy091986, were you way further than expected or just a couple days ?

My doctor went off my ultrasound because my son measured to be farther alone than I expected.

I had that happen to me. From my LMP I was 12 weeks and by ultrasound I was measuring 11 weeks 5days my Dr went off my LMP to determine my due date.

according to my lmp, I was due 02/16 but the ultrasound said he was bigger and due 02/11... either way he isn't born yet

I knew around (2 or 3 days) that I got pregnant so we went off my LMP. Ultrasounds are usually off a little so I would go with what you know.

My doctor told me as long as my LMP and ultrasound were no more than 5 days apart in measurement it would not change my due date.

That's what I thought but when I ask the doctor she said nothing changed which confused me because she was hesitant that what made me look and see what the computer said.

the doctors will let you know if your due date changes. they usually go off of your last period but the ultrasound is more accurate.