Hun, really, try not to worry about it. I tend to make big bubs too. I had almost the exact same situation when pg with DS. They told me he would be 5+kg, he wasn't anywhere near that at 4.2kg. They also predicted DD would be about 4kg. She was pretty average at only 3.7kg. Size prediction scans can be really out of whack, as can fundal height measurements. I always measure big with fundal height. At my last measurement (34+2 wks) I measured 37cm. I just don't worry about it. I have enough to worry about thatn to think about baby being too big....my body knows what it's doing and I will do what needs to be done when it comes to the time. I won't have a c-sec or induction because the doctors decide my body isn't able to birth my baby. I know what I can do and I will do it. If needs be, I will have intervention at the time of birth.

ETA, I birthed DS drug free, intervention free in a matter of a few hours. It can be done. Have faith in yourself hun.