2D ultrasound picture

Torie • God is #1 in my life <3
So today I had my first ultrasound at 13 weeks. It was the most amazing experience I've had so far and made everything seem so real. It was very exciting. The ultrasound pictures I was given look a little odd though. I know appearance doesn't matter, I just want my child to be healthy. But has anyone else had a ultrasound picture that was very odd looking? In the pictures I have, it looks like my baby has a very long chin (it looks very abnormal) I don't know whether I should be concerned or not. Has anyone else had this happen?? Please no rude comments, I just want to know how accurate the scans are. Anyone??????