37 weeks with signs of labor?

I'm 37 weeks a few days... Woke up to cramping like I had to poop. I went to the bathroom and couldn't. I was pacing the floor because the cramping kept hurting. Finally I had some water which seemed to help me go to the bathroom. When I went it was like diarrhea. I have been 3 times and I'm wondering if this is a sign labor is coming soon? It don't recall this with my son.