Baby measuring 3 WEEKS ahead!!!???

Kimberly
So I'm 30 weeks 3 days and my OB told me while she was doing the ultrasound my baby is already 4.5 POUNDS!! 😳 
He's consistently measured 1 week ahead since 12 weeks, but this is...wow! All my other babies came on their own between 38-39 weeks and were 7 lbs even! At the rate he's growing by 39 weeks he will be 12 pounds!! 
I blurted out 'what am I going to DO?!' My OB laughed and said 'you're going to push him out just like you did your last 3...!'
😩 I'm not sure if I feel like laughing or crying! LOL 
All looks perfect and I don't have GD. Anyone else have a baby measuring this far ahead??