Extreme back pain

I’m only 17 weeks pregnant and I haven’t gained any weight as of yet but after being asleep for a few hours I awake in immense pain. It’s all in my lower back and nothing seems to help.

I’ve always been a side sleeper and usually always have something between my knees for support .

Any ideas on what I can do to ease the pain? I would LOVE to take a muscle relaxant but I know that can’t happen. I need pain relief, the hot compress only does so much. Help !! 😫

Has any one been prescribed safe pain medication while pregnant ? If so, what one?