Oversupply help

FTM I exclusively breast fed my son until going back to work at 7 weeks. He still only has breast milk but I have to pump while at work. Since I’ve started pumping, I’ve been producing more than he eats (Ii.e. He eats 8 oz while I’m at work but I normally pump 12 or more). While I like that I’m building a stash, on the weekends my boobs are never empty because baby doesn’t eat as much as I pump! I really don’t like having to pump on the weekends, especially after he’s already eaten. Any tips on how to not produce as much?