My baby girl was measuring 6lbs 12oz at 35 weeks...yea, I feel ya on that one. I have a growth u/s tomorrow to see how big she has gotten, but I know not to put too much into it because late term u/s are known to be off by as much as 2 lbs! My friends doctor induced her at 39 weeks for a 10lb baby and her baby was only 8lbs when she was born! That is a big difference!
Try to get more than one growth U/S, especially if they want to do a section. I had three, and DD's actual weight ended up being spot on to what they predicted.