growth scan...

At my 37 week appointment today I was told that because of my bmi my baby is at a higher risk of being on the larger side.. I have to get a growth scan next week to get an idea of how big she currently is and based on those results I may have to get a c section.. don't get me wrong, I'm really glad I get to see her again, but I have been measuring perfectly my entire pregnancy and have only gained 27lbs. I guess my question is has anyone had a similar situation? How'd it turn out for you?