So I went for my first ultrasound on Wednesday and everything looks great but they changed my due date to a week later than what I thought. This would mean I conceived a week later than I thought and I got my first positive pregnancy test on 2dpo.... I know that's not possible so do I just ignore it or say something? How accurate is it to date by measurements in 7/8 week ultrasound? I know it's a minor thing but just wondering if this happened to anyone else. Thanks!!