this morning I woke up to this intense pain behind my belly button. It almost feels like it would if you had a really bad bruise. This is the first time I've felt anything like it, and I really haven't felt the baby move much today, at all. I'm 21 weeks. (To date I've really only felt small movements, like fluttering...no distinct kicking) Any advice? Should I be worried? Go to the emergency room?