Gas or early labor?

Starting around midnight I was having bad gas pains (...and gas), but I was also having back pain that wrappd around my bump (felt like, but more mild, contractions from my first labor). After two hours I was finally able to fall asleep after having some loose stool. Today I am having a lot of braxton hixks and some more of the painful contractions. Not sure what to think but I don't think it warrants a call to the doctor yet. I was waiting until my son's nap time to time anything. I am only 35+5. Thoughts?