I'd take what you've been told with a grain of salt. When I had my 36 week scan in the OB's office DS was measuring at 40 weeks so he sent me off for a growth scan. That scan had bubs already measuring at close to 8 pounds and the average size of a 40 week pregnancy. I was stressing thinking I was going to have a huge baby, but he was born 4 weeks later weighing 3.7kg (just over 8 pounds). From what I know the scans at the later stages of pregnancy are notoriously in accurate, that's why they use your earliest scan to base the due date on. So if it was me in your position I definately wouldn't be considering an induction or CS based upon the predicted size of your baby.