Measuring 3 weeks ahead

I went in for my 32 week appointment but baby is measuring at 35 weeks and 4 days on everything, and about 5 pounds. I'm due May 4th. I go to my regular OB on Thursday would they change my due date? I'm suppose to have a repeat csection. I'm so nervous they will schedule me earlier to have the baby. Anyone been through this? What did the doctor do?