I need HELP!

My daughter was born 12/6 weighing 7 pds 9 oz. she lost down to 7 pds where she is still at. I was exclusively breastfeeding until the dr suggested that I breastfeed for 15 minutes then pump and give her what I pump. Each time I pump I get 1 oz or sometimes just 1/2 and oz. This is my second day, is it normal to get so little? When I go back to work I plan to pump also but getting so little I won’t have enough to stock up. We go tomorrow for a weight check with the nurse then we see the dr again Tuesday. I am almost positive we are going to have to supplement formula. Has anyone had this issue??