Could this be labor?

I have never been pregnant before this is my first time!

I'm 29 weeks pregnant and my back is hurting quite more then usual and I feel my belly getting tight and like SOME cramps but there not like menstrual cramps a little different. There mostly on top of my belly, and my water hasn't broke at all.

2 weeks ago they thought I was dilating and they did a test that says whether or not I have a possibly of going into early labor and it came back positive, so they makes me concerned.

Maybe it's a stupid question, but I'm new to this so just wondering?