If you weren't charting then an early dating U/S is the most accurate predictor of EDD. Changing your EDD based on later size measurements is never a good idea because a) they're very inconsistent whether you're talking about fundal height measurements or an U/S, and b) even IF your baby is on the bigger size, that doesn't mean that they're further along in their gestational age than you think. Your baby could be 7lbs right now, but that doesn't mean their lungs are the maturity of a baby that's measuring at 7lbs at 40+ weeks, they could just be a bigger baby.
What is the point of an U/S to measure size? Not much unless you have medical indicators that warrant them checking. I personally wouldn't even do it.
Also, I'm not sure how you already have an induction date? Do you have medical concerns that are making the doctors look into size further? If you don't have any medical issues then you really shouldn't be looking at induction at this point regardless of what the date is.