With my first, I had been in established labour for about 2 hours by the time I got to hossy. There was a fill-in ob there and he broke my waters without even telling me he was going to .

With my second, I lost my plug at the same time that I started to feel the need to push - I was fully dilated by that point. My ob then broke my waters but in hindsight I wish she hadn't. I have just recently read that you can birth babies without the waters breaking. Although chances are it would have happened naturally about the same time she did it anyway.