Here's some advice from the MedHelp website and our I'm Expecting app on Cramps. You can find this in the app by going to the Pregnancy Diary from the home screen and selecting Cramps from the Symptoms menu. Then click the menu bar in the upper left and select Symptoms Manual to see your symptoms. Cramps CAN be normal.
http://www.medhelp.org/pregnancy-health/articles/Cramps-During-Pregnancy-Your-Symptoms-Manual/1989
If your concerned I would call the doctor. However, I had experienced the same thing in my early pregnancy. It will ease up.