Pumping milk! … I need advice,

When I git home from the hospital my attempts at feeding my baby breast to mouth were less and now I formula feed and feed breast pump milk. When I first got home my boobs grew size abs in fact got engorged I’m guessing that’s because my body probably thought my baby was really hungry ? Or idk… but since pumping my breasts that day my breasts decreased size and seems like the milk supply as well ? Should I try to power pump? If so how consistent should I pump? If not will stoping pumping help my body get back to holding that much milk ?