so sad :(

I've made it four months exclusivaley pumping but this past week I'm 1 ounce shy for each feeding. One breast gets 2 ounces the other gets 1. My baby eats 4 oz every 3 hrs. I've had to supplement with formula :( it's heart breaking. Can someone tell me I'm not failing my child cause that's how I feel & it totally sucks. I got the honest company formula cause I hear their best.