Bad period like Cramps at 30+5 weeks

I've already called my doctor and left a message but I'm worried something could be wrong. I've been having really intense period like cramps since yesterday morning and no matter what I do they won't go away. I've hardly slept because of the pain, and it's hard to be in certain positions. I've kept up with my water in take and I've had about three bowel movements since feeling the pain. I know this can be a common symptom in the 3rd trimester so I'm trying not to panic but the pain is intense and doesn't seem to wear off regardless of what I do. Any tips? Or suggestions?