Is this labor?

Last night I woke up and my pants were a little wet but i thought it might just be sweat. I went to the bathroom and I mean it was pretty damp but I couldn't tell if it was my water breaking or not so I tried to go back to bed and tried to see if my contractions got worse to be sure. Well I ended up going to work today and since I've been here my lower back and stomach have been incredibly crampy and walking is becoming more and more painful. I have a dr appointment at 8 am tomorrow, and I would rather just wait for that than leave work if this is just a false alarm...anybody have any suggestions on what to do?