Changing due dates?

Catlin
I am currently 28 weeks today. But for months my son has been growing faster and bigger than average. Last week he measured at 28 weeks. I had another ultrasound yesterday to check the fluid around his kidneys and now he's measuring at 32 weeks! He was measuring about 3lbs last week and has almost gained another pound. I don't see my OB again until next week but does anyone have any idea if they will change my due date if this continues? The specialist I saw wasn my OB but said that my due date could very well be a whole month off!