accuracy is: How accurate are the due dates from a 28 weeks ultrasound

My 28 weeks ultrasound said my due date is nov 29 and it's also showing that am 30 weeks pregnant accuracy is: How accurate are the due dates from an ultrasound?last period came on march 8 to the 12.

[gigi599]

The only acurrate ultrasounds for dating are the first trimester ultrasounds, specially the first one! The earlier the better!!!! After you enter the second trimester it can be of for up to 2 weeks ( 2 weeks measuring smaller or bigger) and third trimester can ve even more off!!!!! Don't trust them!!! Go with the dating of your first ultrasound!!!

[Sasha80]

I agree with gigi599