Ive had that same kinda pain for weeks now unfortunately. I'm assuming it's from this giant belly I now have and my backs not used to carrying all this weight. It hurts really bad if I move a certain way too it sucks 🙁

Did you try taking a shower? Sometimes that helped me! Not too sure if it's normal but it did happen to me! I just got so uncomfortable my back always hurt. I do know some people have back labor though so if it gets worse just keep an eye on it! I live in az too by the way :)