9 weeks pregnant .. twinges & cramping NORMAL?

Hi everyone, I'm 9 weeks pregnant! yay! I had an ultrasound at 6 weeks and seen a heartbeat and once again at 8w2d's and the heartbeat was strong & the baby has grown alot already. My big question is since yesterday i've been feeling slight cramps with pulling and soreness and possible twinges in my lower abdomen. I don't know if it's round ligament pain or what? Anyone have advice, I'm kind of concerned. Thanks ladies!!!