I wasn't sure of the exact date of my LMP, so I guesstimated, and ended up with an EDD of 9/2. My first ultrasound said 9/6, but my doctor kept the due date the same since it was less than a weeks difference. The anatomy scan put her right on track for 9/2, but I know it gets less accurate later in the pregnancy.
I know when I O'ed that month but my LMP date and O date are only 2 days apart. The early ultrasound date was the day between them. So I'm due Sept 3-5!
Re: How was your due date determined?