And the relaxin your body is producing can wreck havoc on your hips... but its needed to loosen up your ligaments... just makes it no fun. My wife had some hip and back issues during the last month or so of pregnant.. . we even went out and bought a recliner chair because some nights it was the best way for her to sleep. Oh, and a body pillow. That helped too.
Docs might not have also told you about squatting and lunges. Most know about the walking to induce labor thing, but also thing like squats and lunges can stimulate and start labor. We delivered in a hospital but had prenatal care through a midwife, and one of the exercises that she had my wife do the day she delivered was to walk up the stairs with deeps steps, and kind of bounce up and down her bottom and side to side... reminded me of the jungle book cartoon dancing. It was so silly to watch. But it did help get things rolling. So careful with those stairs and deep steps...
As for having a preemie... yeah. You know the risks... but every day is a little closer.
My mother had me 3 months early. 2 lbs 2 ounces. Was the first baby in our town to use the isolet (spelling?) and survive. I guess there was a pic in the paper and everything. Spent 2.5 months in the hospital, and for years we used to have a 2nd "birthday" for me, celebrating the day I came home.
I guess my point was to state that you are further along than my mother was, and the technology is a couple of decades better... so don't fret too much.