38 weeks pregnant sharp back pain?

Mckenna

Ok I’m 38 weeks pregnant with my first. And I’m getting very SHARP pains in my lower right back that causes my right leg to just give up and I was to just fall wherever I’m at. It happens standing even laying :( is that normal? Is it just how my body is dealing with like at 38 weeks. Last week my doctor checked me and said my cervix is still pretty thick and I feel like it can’t thin that fast but maybe I’m wrong?