I'm 34 weeks pregnant, and I'm not positive, but think I may have had my first contraction?
It happened yesterday, and it was a painful tightening of my uterus. It started at the top of it, and then traveled down. It hurt. Bad. (I can't even imagine what bad contractions feel like!) It lasted around 30 seconds, and then I had another one about 10 minutes later, and that was it.