Uterus small ?!

Marissa
So I just want to know if anyone else went through this...I went to see my OB on Monday(I was 9 weeks and 6 days) 
But when my doctor felt for my uterus she said I felt smaller than 9 weeks! Now I'm freaking out like is it normal? Am I actually not as far a long as we think? My next appointment is in 4 weeks and I'll get an ultrasound..for now I'm just worried.