It's normal I do believe. Just talk with your doctor about it when you get the chance. I know when I was like 30+ weeks with my first my hips and back hurt horribly when I was trying to sleep. Maybe until you talk with your doctor you could ask your significant other for a back rub, sleep with a pillow between your knees, take a hot shower before bed.
Talk to your Dr. And see if it's OK to see a chiropractor... Thank may help a bit :)