Small uterus?

Courtney
So I just got back from my very first appointment they said I'm a it 11 weeks 6 days and the dr told me my uterus feels small so that immediately sends me into a panic and I started asking if I was really pregnant, the last couple days I have been feeling like maybe my tests were wrong and I'm not pregnant, and now I have to wait to get my ultrasound so I'm just more overwhelmed and panic stricken :/