Because of the way that due dates are calculated they are no more than a good guess so it is actually quite unusual for a baby to be born exactly on their due date. I wouldn't worry too much about it now, just try to get as much rest as you can (hard, I know, when you have another child to look after).

Oh yeah, last time I went into labour 2 days over but this time around I've been in pre-labour for two weeks now and I'm only 36 weeks. I'm booked for a caesar next week so I (hopefully) won't get to find out exactly how much longer this baby would've waited but I'm sure there's no way he'd go 40 weeks.