Are these Braxton hicks?

Sarah • 19. Rilee Page ❤️ 8Ibs 1oz, 21 inches long 😍 5.25.15
My belly will get hard & I get pressure it feels like in my lower back and my uterus. They don't hurt it just gets really tight and hard to breathe. They last a few seconds to a minute and are gone. I'm 33 weeks