Baby measuring ahead of time, what does that mean?

ericamanuela

I went for my 18 week ultrasound yesterday to find out the gender (it's a boy!!!) and for the anatomy scan. While I was there they noticed that the baby is measuring 19.5 weeks. When I first saw my doctor they said that I'm due June 18th but then when I went to my 6 week ultrasound they said June 25th and then when I went to my 11 week ultraound the baby was measuring 5.9 cm and it should've been closer to 4.1 and now my baby is measuring a week or so ahead of time. Does this mean anything? Did they maybe get my due date wrong and maybe it'll be a week early? I know that they will not change my due date. Anyone else have their baby measuring big?