Tips for ebf?

I had my baby 10/07 so he’s 13 days old, 2 weeks tomorrow.. My supply is very low. He drinks about 3-4 oz surprisingly & I currently pump exclusively because I’m not sure if he’s being fed when I breastfeed because he gets really fussy and keeps unlatching so I will pump but I pump different amounts; some times I’ll get 1 oz, others 2-3 oz altogether. It’s frustrating.. I had my tubes tied & was unsuccessful with my other 2 kids so I really want to breastfeed my last baby but I’m getting so frustrated.. I’ve tried fenugreek (but stopped), I tried lactation cookies & I’m currently trying Milky Mamas snacks & drinks along with their herbal supplements but I’m still seeing no difference.. I’m not sure if he’s latching right but I am assuming he is from my research. I’m just not sure if he’s being fed & I try to keep him on the breast as much as I could but sometimes it just gets overwhelming..