pelvic pain/pressure

Lizzy

Ever since i woke up this morning I've been experiencing really bad pelvic pain. It feels like period cramps but its only below my belly button. First there's pressure and then there's cramping that comes every few minutes but only lasts a few seconds. It's really really painful. Any clue to what this? I go to the dr in a few hours so im not to worried about rushing to she hospital or anything. I'm 35 weeks.