Weird symptom?

Julia
Ok Ladies, this might sound odd, but I'm 6w2d, and I've been having lower abdominal pain (around the bottom of my uterus, I think) at night and it hurts so bad, it wakes me up. It's like an intense aching, and I start feeling it down my legs too. It's pretty painful. I get up and sit on the toilet, and I end up having a bowel movement (tmi? sorry!) and the pain stops, and I'm left all shakey and sweaty. I have not been too constipated, but perhaps a little. The nightly, painful ones seem to be a normal BM for me...anyone else experiencing anything like this??