Is this braxton hicks?

I'm having menstrual like cramps and dull back pain. I can't tell if it's constant , regular, or irregular. Gets so much worse when I'm walking. So bad to the point I have to sit down and breathe through it. It hurts. That happened twice earlier when I was working, but since 2 am I've been on break. (I'm at work right now) just feels like really bad period cramps when I'm relaxing. It's weird and hard to explain. No bleeding or weird discharge.

I'm 33 weeks and like 5 days I believe.