What do I do?

I'm a FTM (22 weeks) and was wondering if there is anything I can do to relieve the pain I'm getting in my back? I've gotten used to when my baby puts pressure in my lower back, but now I'm getting pressure in the middle part of my upper back? Will belly bands or anything like that help support my back? I've tried my heating pad and used it for my back, but it's not doing to much. Suggestions please!