36 weeks today and back is severely hurting

My family members think I'm in early stages of labor and it is starting in my back. I can't get any relief, I've tried soaking in the tub, placing pillows behind me and stretching. Nothing seems to be working. I have a doctors appointment on Friday, it will be the first time I see if I'm dialating. I have a feeling I am. Hopefully I get some relief soon, either from the pain or from meeting my son.