It also depends on your financial situation too. Im tired really really really tired but there is no way I can give up work this early. If I had my way I wouldnt have worked the entire time too and if I win Powerball tonight I wont be going in tomorrow. Sometime health issues come into it too. I planned on going off 2 weeks before my due date last pregnancy, got PE and ended up having to stop 2 weeks before that. Its an individual choice I think.