Pumping While EBF

Alexandra • B 2/2019🎀 TTC #2 since June 2023

My 9.5 weeker is EBF but I’d like to try to start pumping so I can leave her with a sitter on occasion and have dad help feed her. I pumped about an hour after she ate mid morning and only got 1 Oz out - any tips? Should I just pump once in the morning to build a stash or try to pump an hour after feeding? (She still eats about every 2 hours except at night). Thanks!