Does Anyone Know What The Statistics Are Regarding Overdue Deliveries For First Time Mothers?

I am 2 days overdue with my first baby and am wondering if I'll be pregnant forever! I askewd my OB and he made a joke about it. When I asked him how long he would he let me go if I went past my due date, he promptly replied "Well, that depends on the bribe... A bottle of whiskey will get you in really fast, and a box of chocolates - well, maybe not so quick" He's a real funny guy. At the time I just laughed and didn't bother to get a real answer out of him. I was hopeful I'd just have the baby by my due date this past Sunday but here we are on Tuesday and I'm still waiting. Does anyone know what the statistics are regarding overdue delivery's for women having a first child? Appox. how many days past due does a first time mother go before her baby is born? I can't wait to meet my little one and I'm so scared/excited right now. The suspense is driving me crazy!