Most likely the size of and weight of the baby . Cross your fingers if you'd like but don't get your hopes up :-( most likely just a big baby
I know it's hard, but do not associate size with development. just because baby may weigh the same as babies two weeks older, they are still lacking that very important two weeks of development so try to think of it that way. chances are, baby will not be two weeks early simply because of its size.
I know you didn't associate the two, it's just something I like to point out as food for thought
Probably not. In my experience measuring ahead doesn't have a lot to do with weeks its just an indication of size. They track growth and if you're measuring too far ahead early on its likely your due date is wrong, after 20wks if baby is measuring too far ahead all of a sudden its more of an indication that they need to look into conditions like gd. If baby has steadily been measuring ahead, chances are you're having a baby that measures above average. My first was measuring almost 3wks ahead, and this one at almost 32wks measured in the 83rd percentile. I just have big babies :)