Well, I can't really answer the first question because my water didn't break until I was ready to push. But I guess I would listen to my gut, take my temp. to check for infection and concentrate real hard on getting a baby out.
As for the second question, I would go to the hospital any time before 35 wks, I think. After that, I would birth at home, but until 37 wks, I would be more likely to go in for a baby check up earlier than I would otherwise. But at 25-30 wks I can't imagine staying home. That is just asking for trouble, babies that young almost always need help. I think it is important to look at medical interventions as both a blessing and a curse. There are situations that doctors are great for. A regular, healthy birth isn't one of them.