Pumping after feeding!

Desiree

I'm a first time mommy and 7 weeks PP I'm trying to keep and get my supply up(I'm also.taking fenugreek) . I do supplement with formula and have been since he was 4 days old. But they say to pump after baby eats but when I pump not much comes out at all. Is that normal? Like maybe few drips but that's all.

Tips and advice would be helpful thank.you!