In a few weeks behind you and had cramps off n on the entire time. Pretty painful at times. Keep an eye and you should be ok. :)
I had cramps off and on throughout a lot of the first trimester and some of the second. My OB said that it was my uterus expanding and not to worry, especially if the cramps are mild (mine were like mild period cramps) and if you are not bleeding. I would definitely check in with your OB though, just to be safe.