My last two pregnancies I measured big, always ateast 2-3 weeks ahead, they kept telling me I was gunna have a big baby, when in actual fact I carry a lot of water and my babies came out at 7lb12oz and 6lb15oz so try not to worry.
I've been measuring big my entire pregnancy like a few weeks so doc did an ultra sound abd she measured perfectly with where we thought i was. Measuring big can be extra water if you had extra pounds to start bloating.. A lot of things let your doc do the worrying they will make sure you're baby is alright
Im 37 weeks tomorrow and measuring 40 im worried :s