Okay so I was just thinking , The doctors go off of when your last period was to estimate your due…

When do you have your first ultrasound they can tell you then ?

And there are due date calculators online

Go off on the ultrasound. Both my babies I had a fake period while pregnant so you just never know

@lydia09876, I had it when I was 9 Weeks , they said everything looked about right . But I sow somebody post that said they we’re measuring out to be 38 weeks but they were 34. That’s why I asked

@keilaa, I always measured under too but I had her at 35 weeks so you never know really lol

@lydia09876, was she tiny ?

@keilaa, 5 pounds

@keilaa, but she was fine still got to go home on time

@keilaa, now she’s almost 4 months and 12 pounds

They usually just go off the ultrasound. I had no idea when my last period was. My first guess was off though. They adjusted my due date to July 29. They measure crown to rump to get the EDD.

I believe the consensus is that your due date can still be off by plus or minus 2 weeks.

With my son, my due date was 10/28 and I had him 11/03 because a membrane sweep was done. I’m sure he could have cooked in there for another week, but they were getting worried amniotic fluid would be low. They never let you go two weeks past your due date.

Theyll usually go by the first ultrasound. My last period was june 21st but i didnt conceive until july 24th(ish) so if u go by my last period i should be farther along than i am

first ultrasound before 20 weeks is the most accurate give or take a week unless ur stressed or any other problems . baby's measure the same usually up to 20 weeks! i was told most online calculators are accurate they'll give u the time frame which intercourse occurred to get pregnant with that due date and the time when ur lmp was !