Not a problem at all!!
The measurements are only an average. Baby could have had a growth spurt, could have moved and is now in a different position, etc. I have measured 1-10 weeks ahead. Granted the 10 weeks is well beyond normal and was because of extra fluid. But normal for me is 3-6 weeks ahead. :)
IF you keep growing bigger and bigger (measuring more and more ahead each week) they will probably do an ultrasound to check. But three weeks isn't really that much. And most women 'level off' towards the end.
at 2:15 PM on Sep. 22, 2012