Birth weight

If my baby boy weighed 4lbs 7ounces (according to the ultrasound) at 31 weeks, how much would you estimate his birth weight to be if he’s born at 40 weeks?

I’m 36 weeks 3 days right now and my doctor said he feels to be between 6-7lbs now.

I know this is all an estimate and probably completely inaccurate. I am just curious to see opinions or experiences!