Can Back Pain Be a Sign of Labor?

I was just wondering if back pain could be a sign of labor? Since about an hour ago my lower back has been killing me. It has been aching non stop. It feels so uncomfortable and it aches and feels strained. My front around my pubic bone feels like I am ovulating or getting ready to start my period and I am having little stinging pains in my upper tummy. I was just wondering if this is normal or should I be worried?