17 weeks and where I'm carrying

As

When my doctor checked for the babies heartbeat it was way below my belly button and right above my pubic bone. Anyone else carry low? Is that normal? Is my baby not growing? I also am not showing. I'm 5'9" 160 lbs only have gained 4 pounds since I've found out I was pregnant. Anyone have any advice? Am I just crazy? My mom says everyone carries different but idk