I have had what feels like diarrhea cramps but the worst ever coming since 1:14 this morning I'm not…

I have had what feels like diarrhea cramps but the worst ever coming since 1:14 this morning I'm not sure how far apart but I got up with my girls at 6:40 and I have had 4 already an they are so painful. I'm headed to my 35 weeks ultrasound now but I'm considering mentioning to them at the hospital to see what they say