Resolution Update (week 2)

So I started my new resolution with 2 workouts and felt pretty good about them. But then I started to have some light cramping that scared me a little. It wasn't anything that made me think "I should go to the doctor" or "something isn't right", but just enough uncomfortableness to make me think I was pushing myself too hard. Which SUCKS. Other than feeling crampy, I felt amazing after those workouts. It felt good GREAT to get my body moving again. Needless to say, I put off working out this week until I would see my doctor for my monthly prenatal appointment. She said it's probably just growing pains (although I know this is different that regular ol' round ligament pains, because joy of joys I've been experiencing those too), she took a urine sample just to be on the safe side, but didn't seem overly concerned.
I'm concerned about everything though. That's what a preemie mom does as soon as she finds out she's pregnant again; she worries about all the things that could happen and prays that her little one holds on tight for at least 37 weeks.
So I can't push myself, but I can't lay on the couch with my feet up for the next 24 (give or take) weeks either. Any helpful suggestions or exercises I could/should try?? I'm game for most anything.