OMG!!!! Just left my ultrasound ...

Ok I'm due 7/25 and I'm going to be 35 weeks on Monday. I just left my ultrasound and she said the baby is measuring at about 39 weeks. His head and belly are definitely  measuring 39 weeks. Head is low also. When she pressed the wand low on my belly it hurt so bad and she was barely applying pressure. Anyone else experience this??? Did you deliver early? I see my doctor next Thursday for my first cervical check. 
** also I know the weight is usually off and not accurate. I'm more concerned about the head😆 also that is 4 weeks ahead. Seems like a lot.