Contractions either real or probably Braxton Hicks. If they are really painful or come close together go to the hospital
Braxton Hicks, those are not cramps . You are experiencing light contractions.
I believe that those are early contractions. Kind of like early labor or false labor. Either way, don't freak out unless you can't handle the pain. That happened to me the other night and after 2 hours it went away. Real contractions increase in intensity and come at regular intervals.
Your body is just practicing. If you're still concerned call your doctor in an hour.