When you start getting tight and then it backs off start a timer, stop the timer when you start getting tight again. If they are 3-5 minites for a couple hours go in cuz its active labor (:
511 rule. 5 mins apart lasting 1 min for 1 hour. Then go to the hospital. Or call your doctor and see what s/he says.
I'm not gonna lie I'm not even sure how.
Might be contractions, can you time them?