personal question: any bleeding or discharge? and if you have really bad pains I'd go to the ER just to make sure. but a little cramping or pain isn't unusual because your uterus is getting bigger and your body is making room for the baby. I'm no way a doctor but if it continues to get worse I'd get some help to be safe.
Its probably normal since there is no blood but if it gets worse I'd call the doctor. :) i think your body is just adjusting to the pregnancy because I used to have the same cramping/ pain.