TMI Feeling Like I Need To Poop?

Sorry for the TMI but at this stage in the game it doesn't matter to me anymore haha. All last night I had TERRIBLE cramps but they didn't feel like normal contractions where they start out bearable, then get more painful and taper off. I couldn't time them. It was more of a constant ache/cramp. The entire day today I've felt like I've needed to go to the bathroom (but I already did) and nothing comes out! It's painful to walk and I definitely have the pregnancy swag going today... I'm 36+3 and was checked on Tuesday with no dilation. Does anyone else have this or can anyone tell me what's going on?