"One" of my Due Dates

So I was just sitting here thinking that today, October 14, is the day I thought I could be having my baby. At my 12 week sonogram, the doctor wanted to change my due date to 1 week ahead. My OB, however, said it's just a target date and we'd stick with the 21st. Then at the 20 week sonogram, Baby B measured exactly 1 week ahead and the sonogram tech wondered why my doc hadn't changed my due date to the 14th. And finally, at a sonogram I had at 35 weeks, the sonogram tech again measured Baby B exactly 1 week ahead. I guess my doctor may have known better than them, huh? :) Let's hope she surprises us sometime in the next 7 days!