Continuous "contraction" pain?!

Meghan
Not sure what this is and doc not very helpful. I woke up last night out of a dead sleep with pain in the top of my stomach it felt like a continuous contraction up on top instead of around I did get the band of pain around my back as well though like a real contraction. It lasted 3 hours straight. It hurt so bad I cried. I'm 35 weeks measuring 39 weeks could my due date be off and I'm starting to go into labor or does this sound like something else to anyone?