Braxton Hicks or not?

So lately this week I've been having sharp lower back pain more in my left side. When I get up out of bed or just laying down my stomach tightens up and when I start walking around it relaxes. Plus having these stomach cramps = poop trips to the bathroom. Sorry TMI, but are these considered Braxton hicks? I was expecting painful cramps like what other mommies have talked about.