Pumping

Felecia
Do any moms on here have experience with increasing your milk supply when only pumping? My baby girl had to come early due to complications and had a 16 day nicu stay. I have been pumping and bottle feeding, even after being home, to ensure she is getting enough since she is a premie. I can tell my supply has decreased since she was born (3 weeks ago). I am trying to increase my supply because I am afraid of running out. Also what will it be like when I do introduce breast feeding? I am a first time mother and really hope to still be able to breast feed eventually so I want to make sure I keep my supply up. Any advice would be greatly appreciated!!!