I need breastfeeding OG’s on here

Hey ladies I’m 2 months into breastfeeding and my baby girl does not receive bottles yet but I have started building my stash but doing so my milk supply has decreased when my baby girl is ready to feed! I thought pumping would increase my milk supply but it’s actually decreasing it !

Another question (Baby girl does not empty my breast. Should I pump after feeding her or just let her wake up and eat ?