Cramps that don’t come and go

I’ve had one or two cramps that come across my entire uterus, and feel like a widespread menstrual cramp. They kind of hit, then leave. I’m assuming those are Braxton Hicks, correct?

Except today I’m also having cramps that are constant. It feels like a menstrual cramp too, but it doesn’t come and go. It feels just like when I have my period, it comes on and sticks around for some time.

I’m REALLY well hydrated (I’ve been sick and home drinking water all day) so it’s not that. Is it just a different type of Braxton Hicks?