Wow...seems like so long ago we were both on the trying to concieve boards! Then we both got our BFP's! That was so exciting!
Im sure you are probably SO READY to have this baby! If it makes you feel any better, I was five days late. Seems to be common...especially for a first baby.
My last Dr. appt was 4 days after my due date and the receptionist told me to eat pineapple to bring on labour. The Dr. was behind the desk rolling her eyes and told me that if these old wives tales methods really worked then they would have taught her in med school! LOL! I tried the pineapple thing anyways and low and behold, 8 hours later I was in labour!
Try not to take too much stock in what the estimated weight of your little girl is. It's just that...an estimate.
I guess that she just wants a little more time before she makes her grand enterance!
Good luck...and let us know how everything unfolds!