Pumping.

I just had my daughter 6 days ago, and I want to only pump at night. Maybe 2 bottles. I don't want to breast feed. So I was wondering if I get in a routine of only pumping at night will my boobs get used to the routine? Or will my milk dry up? Will they continue to hurt until I pump them? (Also, I've been getting about 4 ounces from both boobs combined.)( I don't continue pumping after I get to 4 ounces, I just stop)