I'm due on the 27th, and bub can easily decide to come out on the 29th!
It will make it's birthday interesting, though I'm sure he/she will get sick of people asking about its birthdate.
Dont know if we'll celebrate on the 28th or 1st if bub comes out on the 29th. LOL - I can imagine bub having a mid-life crisis while technically still being a teenager! whooa!