Tips on Avoiding a C-Section

I had my 12 week appointment yesterday (I was actually 13+4 but measuring closer to 14 weeks). My doctor discussed with me that since my last baby was large, 9 1/2 lbs, and got stuck during delivery, that my odds of needing a c-section this time are pretty high. My first two were 6 lbs 6 oz (at 36 weeks) and 7 lbs 15 oz (40 weeks). All three were vaginal births with no tearing and no issues other than the last getting stuck a bit. I was told that I'd have a growth scan at 37 weeks and that would determine how I would deliver. He said he would only let me go to 39 weeks this time also (#3 was born at 40+6).