Should I call L & D?

It's 4:30 am and I started having diarrhea at like 11. It went away enough to where I slept until 1 am, but it's been happening since 1 am. The cramps are so awful and it doesn't stop and I'm in tears on the bathroom floor and I don't know what to do. It takes tremendous and painful straining to get anything out. I have been getting some contractions I think but it's hard to tell with the diarrhea cramping. I'm due on Tuesday. Idk if I should call just because it's been hours and I'm in so much pain and don't know what to do and not really sure what labor will feel like. I'm also afraid to get in a car in case I need to use the toilet. It's like every time I think I can lay down the pain comes again so intense and awful I just run to the toilet and nearly pass out trying to push anything out, then it subsides for a while and comes back randomly again. Doesn't feel like contractions so I think it may just be an upset stomach but it's so painful and idk how to make it go away