Re: running while pregnant
As long as you're not new to running, it should be fine. I was in the USMC when preggo w/my first & I ran for a while not even knowing I was pregnant, then I continued to run b/c I had to do regular workouts until a certain month. The only reason I ended up stopping is b/c I had a high risk issue that I found out about a few months into my pregnancy.
Cramping was normal for me, especially in the beginning. I think it's the ligaments stretching.