All my kids came out late and over 8lbs. They were also all induced babies. They were too comfy in there. Maybe your obgyn was way off or she may have drank some castor oil to induce herself because she was tired of being prego.
The father of my kids fell asleep while I was writhing in pain with my first kid and went for Chinese food while I was having my second. Men are bastards when you need them most.