I have no idea, I never asked for the numbers but she said I was measuring "on track" which like pp said, I'm assuming is within a couple weeks.
Fundal measurements aren't super accurate (or telling), especially early on. With my first I was consistently measuring big so I did eventually have a growth scan at 36w which showed a slightly larger than average baby, but mostly just extra amniotic fluid (DS was 8 lbs. 1 oz. 3 days late FWIW).