growth scan at 38 weeks +1

Had a growth scan today and they say my baby boy is 8lbs 15oz already! I asked for my membranes to be stripped yesterday at my appointment but she said not till 39 weeks. I'm dilated 2cm, 80% effaced and he is at -2....now with the results today they have me scared to deliver! The tech kept commenting on his size and that he has fat rolls already. I have only gained 20lbs this pregnancy....so she really made me feel like a crap mom because he is so big...ugh pregnancy hormones at their finest! I hope he decides to come this weekend!