Back Pain

Hailey πŸŽƒπŸ
I'm 21w1d with my first, and I've been having horrible back pain around my right kidney sometimes on the left too. It's been going on for a while now. At first it was a dull ache, more uncomfortable than painful. Now it's an awful pain that keeps me up at night and sometimes makes me cry. Has anyone experienced this before? I see my Dr. in 3 weeks