feeling discouraged with pumping

I posted a photo last night of my first pump ever and pumped 1.5oz which was good I was told. this morning a round 7am I was only.to get 1.oz and than at 11:00 I was only able to get may be half an oz and I pumped for 30 min. I'm feeling like this isn't enough to feed her, and if I will ever be able to pump more? I've never done this before so I don't know if it's normal to have a low supply just starting out. (daughter was born on Sunday) so took me a couple days to start pumping.