If you are 8 months along in your pregnancy and you are experiencing back pain and hip pain, it could just mean that your body is taking on a lot of weight from the baby and you will need to rest more often. If the pain in your lower back becomes sharp pains or continues, it would be good to see your doctor.
Your baby is getting ready to come out so he/she could be just getting comfortable at your expense. Pushing things around to make more room. All that fun stuff that happens in the last part of being pregnant. Good luck