Sounds like contractions. At first, they were only like cramping for me, until you get farther into labor. That's when they start getting painful.
With my first son it didn't hurt me at all an nobody believed me until I went to the hospital and I was 6 cm everybody couldn't believe how well I handled it
My contractions didn't hurt me either until about a couple of hours in. Sounds like they might be contractions. Doesn't hurt to go to the hospital. They'll check you in right away