You wait! I was a few cm's dialated with my DS at about 37wks. I was in pre labour for about 2 weeks. On the positive side when I did eventually go to hospital, at 41wks, I was 8cm dialated and DS was born an hour later!

But there are things that are said to bring on labour or ripen your cervix for birth, like light exercise (such as walking), sex, evening primrose oil, raspberry leaf tea/tablets, massage, accupuncture....

Good luck!!