Breastfeeding

Mstoya0818
Help! My son turned 2weeks today. Delivered by scheduled c-section. He weighed 8lbs 4oz @birth. 7lbs 10oz @discharge.. He weighed the same @his 1st doc check up 3days later. He had to returned to doc 2days after for a weight check and he weighed 8lbs. Now today @his 2wk Check up  (5days later) he weighs 7lbs 12oz. 
My original plan was to breast feed and I started that from birth. I didn't feel like much was coming out and I tried to stick with it. Being that his weight at the 1st doc was the same as the discharge weight I was told to give 2oz formula after breast feeding. He would get really fussy during breast feeding as if he's not getting enough. So Tuesday I decided to just give formula. Now today it seems like maybe he was getting more than I thought because he lost weight since the last appointment. Very disappointing.. I cried. I'm sad. Feels like I'm letting him down. Idk what to do @this point. He takes 2oz of formula so I have to feed him every 2hrs. Weight has to be checked again tomorrow. My question is: can I try to continue breast feeding even though I stopped Tuesday or is it to late? What can I do to increase my milk supply?