Estimated weights vs. Actual birth weights?

Alyssa
I just went and saw my GD OB and they estimated my baby at nearly 9 lbs already. I am 38 weeks and 4 days. They said it's likely she'll gain another half pound at least in the next week and that even if I go early they wouldn't be surprised if she was over 9 lbs. I am desperately hoping they are overestimating!! Anyone else have this happen? Praying to hear good news from other moms who's babies weren't actually as big as they were predicted to be based on ultrasounds. 
UPDATE: My daughter was born 6 days early and she was only 7 lbs even. Needless to say they were quite off. Still ended up with a c-section, largely due to their estimates. Needless to say I wasn't to thrilled.