I'm pregnant but I don't feel pregnant?

Shell • Momma to a little man named Malik! ~avoiding pregnancy!~
I'm 15 weeks and not showing. No morning sickness. No mood swings. No more frequent bathroom trips. No more fatigue. I do have food cravings but that's all. I forget I'm pregnant all the time! When I go to the ob we listen to the heart beat and it's always strong. But why don't I feel pregnant? Is this normal at 15 weeks?