Good supply but I want to supplement

Would it be a terrible idea for me to supplement with formula like once a day while I nap?! I have a good supply I just don’t want to pump yet 😫 my daughter is 2 weeks old. I exclusively breast fed my son for 2.5 years, had a 6 month break and now I am EBF my daughter. I just want to nap for a couple hours a day while my husband watches her without worrying about pumping. Is this so selfish?

Would my supply drop?

*I’m not sure if it’s the same but I was an over supplier with my son, I donated multiple times. So I was just assuming I’d be fine this time. Thanks ladies!