It's very normal to have cramping while pregnant. The uterus is growing and expanding, and will continue to do so the entire pregnancy. It shouldn't be no more than mild-moderate pain. If its severe you need to see a doctor.
I thought I was going to get af for weeks when I was first pregnant. Its normal and probably will continue on and off. At least mine has and I'm 16 weeks now. Don't worry other stuff will start hurting soon too! ;-P Best of luck! And congratulations