A contractions feels like a bad period cramp. Don't get it mixed up with Braxton Hicks though. The real contractions makes you dilate and also helps your baby to come out while in labor. Hopes this answer your question. But you already full term so it mean your baby could come any day now. Good luck!
It's a painful tightening feeling. Like your baby is balling up on you then relaxing.
Still need help with my answer