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
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.