breastfeeding

C
Hi all,
My baby is 15 days old and because of low birth weight pediatrician suggested formula and now she's used to bottle and my milk supply is very low to fill her little tummy. I'm taking fenugreek and thistle capsules and started pumping every 2 hours today. 
Did anyone experience this? I'm losing hope of producing more milk and breastfeeding my daughter :( 
It's upsetting and depressing. Any suggestions would be appreciated. Thanks in advance