Ok. So I'm currently 8wks 4days pregnant and last night at work, I must've been moving too much or something (I dance), I feel like I pulled a muscle in my stomach. After that, the rest of the night, when I would sit in a certain position I would feel it again. Started to get slightly painful the more it happened. Could it be my utterus expanding i.e. growing pains or should I go to the e.r. to make sure everything's ok??? I don't even think the utterus popped up yet.