Regretting formula :(

I breastfed for 9 weeks and then started to supplement with formula. Now I have hardly any breastmilk left for her. I am feeling super guilty for starting formula just so I could get more sleep and so she would sleep better through the night. One bottled turned into two and so on. Now I can't even give her a full meal through breastmilk. Anybody else having the same guilt? I want to get my supply up. I know how but my question it even possible at this point? I just pumped after not feeding her for about 5 hours and got only 1 ounce :( feeling like a bad mom 😭