I don't think it does happen to everyone, or at least not to the same extent. It did with me - I remember with #1 wailing at my dh "I have so much to do, I CAN'T have this baby until our books are all in alphabetical order!". Also cooking lots of freezer meals, which was definitely one of the more useful things I did...
But don't worry, you'll be busy enough when baby arrives, so why not take it easy and enjoy your last couple of weeks of pregnancy.