Pelvic girdle pain?

I'm not exactly sure what I have been experiencing as everyone tells me "you're just growing/stretching". Ever since the beggining of my second trimester, I have had this horrible pain in my right hip, very very low back area. It gets so bad to the point where I can't walk, can't turn over or even move at all sometimes. It stops me dead in my tracks. It feels like something is out of place or needs to pop. The only thing that helps is rest. I notice that it's worse after a long day of work or cleaning. When I finally sit down, the next time I go to get up, I physically can't. It has progressed so much that I'm starting to think it's not normal. Have any of you experienced anything similar? What the heck is going on with me.