Supplementing with formula at night??

So I've been EBF for the last 4 weeks. My baby eats every 2-3 hours on the dot, sometimes every 30-60 minutes, I asked my pediatrician about formula to supplement 1 or 2 feedings a day so her dad can feed her and I can sleep more than 2 hours because I am very overwhelmed. He just said "everything is going good, keep breastfeeding."

I feel like he wasn't listening to me and I want to supplement for her night feeding. Has anyone else mostly breastfeed but supplemented 1-2 feedings a day?