Am I producing enough?

M • 💍🐶👶🏽🎀👨‍👩‍👧💕
My baby has an awful tongue tie and I have an inverted nipple, so latching and nursing is really hard for us. she lost too much weight and they asked me to start pumping to give her a bottle. 
Now I exclusively pump and bottle feed, but I'm not sure if I'm producing enough. 
I'm 4 days pp and pump every 3ish hours. Usually I get between 2-3oz every time I pump. Is this enough? Should I worry about losing my supply? 
I'm so confused and lost 😞