Worried 😩

So I had my first US Wednesday the 8th. According to my lmp and cycle length and intercourse days (I tracked EVERYTHING!!) I should have been 7 weeks.. Well my ultrasound tech said I was 6 weeks 1 day and 123bpm. She never told me any measurements or anything.. 
Anyways I'm freaked out because I see all these other U.S. Pics that are dated the same as me and their babies are quite a bit larger..
Does my baby look small???