DD1 was born at 41weeks 6 days. DS1 was born on the EDD. However, I had PTL and was 7 cm dilated at my 40wk appointment so the CNM broke my water. She was afraid I wouldn't make it to the hospital... DS2 was born at 37 wks (CNM stripped my membranes without my permission....) DD2 was born at 38 wks.
The funny thing about DS2 was that he was born on my EDD for dates. The ultrasound put me back 3 weeks and he checked out at 37wks. The theory is that since I was still breastfeeding, my ovulation was delayed three weeks. So if you want to get sorta technical, both my DSs were born on their EDD!