FTM!!

I went to the hospital because I was throwing up eveything including every liquid I was putting into my body and I didn't want anything to happen to my baby... They gave me a ultrasound and transvaginal.. Not bad....and the do for said that the baby is measiring 6 weeks and 5 days...but I was 7 weeks and 6 days....is that normal? Please don't be rude I am really new to this