Most pregnancies last for about 9 months and doctors are likely to induce labor if pregnancy goes on too long. That being said, it is possible to be pregnant for a whole year. The world's longest pregnancy lasted 375 days, strangely, the baby was only a little under seven pounds.
It certainly puts a whole new perspective on being a few weeks late, doesn't it?
If you are pregnant, ask your doctor before you start to worry about these weird things you just found out. Link
(Image credit: Flickr user ChepeNicoli)