Good on you! The chances of you going into labour before then are very low, and even if you do, the chances of uterine rupture are so low that you will not be in any danger, and they will more than likely have plenty of time to do a c/s.

Be prepared for the OB to keep pushing you to have it earlier though - he will probably still try to convince you that 38 weeks is better. Just stick to your guns and do not let him scare or guilt you into changing your mind.