Doctors baby measurements off??

How off do you guys think the estimate measurements that the doctors give are?

I’m almost 36 weeks and had my ultrasound today to check that baby is head down. This is my 3rd pregnancy and for both my other children, I have given birth at 38w4d.

My son was 7.7 (17 y/o)

My daughter was 8.4 (23 y/o)

This one feels like he’s gonna be even bigger so I was surprised that my doctor told me that he will probably be in the 7s🤔 hoping she’s wrong because I actually want a bigger baby. Was just so confused because my belly is really big too. (I’m 27 now).

Anyone give birth to a baby way off on the weight estimate?