I can't imagine if you went full term with him.
Measuring big doesnt necessarily mean you will deliver earlier. Possibly just a bigger baby. My son measured 4 weeks ahead from 24 weeks to the end. I was induced at 36 weeks due to ovarian cyst problems and my son was an 8 pound preemie. Imagine how big he wouldve been full term! :) Dont worry.
Does your doctor think your baby will come early?
Oh honey my little baby is always measuring ahead. The first ultrasound at 9 weeks it was measuring a week ahead and I had another ultra sound at 10 weeks (bc of a scare) and the baby measured at 12 weeks!! It's a fast growing little nugget. I have come to accept I'm gonna have a big baby.