How do I explain this HELP

Ok so when I stand up or use the restroom my contractions speed up and my lady part it has this weird feeling like you know when a tampon expands on your period accompanied with cramps and I know he is moving but it just feels so weird compared to normal. I dont know how to describe it. I know contractions are supposed to hurt alot but I have always had really painful periods. (A few sent me to the er) so my pain tolerance is high. I stubbed my toe yesterday and didn't know till I looked down. So I am worried that this might hurt more than I know. How do i explain this to l&d i dont think they understand what i am trying to say. I am 37weeks btw