12 weeks and not a bump?

Rachel
I'm only 130 lbs and 5' even and I'm 12 weeks but with no baby bump. Heard the heartbeat, have had an ultrasound and saw the baby but now I'm just feeling weird because I'm not showing at all. My first pregnancy, I seemed to blow up pretty quickly (given I was much younger and thinner). Is anyone else not really seeing a bump at 3 months in??