Duh.

From an email from my hospital:

While we often focus on a single day-as if a delivery before that day were "early" and one after is "late"-the truth is that your baby is due anytime between weeks 38 and 42, and your due date is simply the day that falls in the middle of that period.

So, I know this. Logically I do. But I guess I always think of that as what you tell yourself when you go *past* your due date. Seeing it spelled out this way made me gasp out loud.