I am 22 weeks pregnant. Last night (while I was trying to sleep) I had sudden, intense pain in my lower back on the left side right about my butt. Depending on the movements I made, the pain would come. Today I feel the same thing. Depending on how I move, there is a sudden and intense pain. When I walk, the pain kind of eases when I put weight on the side that hurts. (Which is weird) And it hurts more when weight is put on my other side. I was thinking about Posterior Pelvic Pain, but I m not sure what s going on. What do you think?