Ultrasound early pregnancy which scan more reliable 9 weeks or 11 weeks?

Ultrasound early pregnancy which scan more reliable 9 weeks or 11 weeks?
Question by Bubbles: Ultrasound early pregnancy which scan more reliable 9 weeks or 11 weeks?
I have had two pregnancy scans so far. One at 9 weeks because of abdominal pain and another routine dating scan at 11 weeks. Both have given different dates for the pregnancy. The second scan said I was a week further pregnant than what the first scan showed. I am very confused because I thought scans this early were supposed

ultrasound early pregnancy