Gas pain, Braxton Hicks, or contractions?

I’m 19w4d pregnant with my second baby. I’ve been having pain on and off all night. It start at the top of my stomach above my belly button then goes to the bottom. It really hurts but my uterus isn’t hard when this is happening. I’ve tried peeing and drinking water but it didn’t do anything. I’m not bleeding. It also goes to my sides. It’s not in a pattern either. I don’t think I experienced this with my first.

If it keeps happening I’m definitely going to call the nurse. Just wanted to know if anyone has this happens and what it was