Actually the research I've looked up said you are still in a normal pregnancy zone up until you reach 43 weeks. I would avoid induction until then personally, but probably would want to have that NST thing to make sure everything was going good after you go to 42 or so or if they insist after 40 that's fine. I went 38 with my first, 39.5 with my second and 41 (+2 if you go by doc dates) with my third. All of those are completely normal. I read that average spontaneous labor happens about 41 weeks with a first time mom. I would post links, but I just remember this stuff from when I was pregnant with my daughter and went over. If you do some internet searching, you'll find more info on that. Look for when natural spontaneous labor happens on average or something.