If they they come n go for an hour then call you midwife or gp...
It could indeed be labor. If they feel like menstrual cramps then chances are it's the beginning stages of labor. With my first I began laboring at approximately 1am with slight menstrual like cramps, that came and went I was able to go to sleep thinking maybe it was early labor, then I woke up at 5:30am with the pains only much stronger and closer together lasting about a minute each coming every 2-3mins. I called my friend to ask her if it was labor and she told me it was. So I went to the hospital after first eating breakfast and when they checked my cervix I was 5cms dilated.. Needless to say, it was labor and my son was born at 1:45pm.