I had braxton hicks contractions, and my back just hurt so bad I would just lay in bed and try to sleep them off. They only seemed to come when I was under extreme amounts of stress. No stress now, so hopefully no more. Relax as much as possible.
Hopefully it's nothing serious
I've had that as well and hear I had a uti that went into my kidneys. I hurt so bad I couldn't walk and thought I was having a miscarriage. I would call the doctors tomorrow and tell them what your experiencing and see what they say. Good luck!