Low milk supply, any suggestions please?

Hi mummies, my baby is currently 6 weeks and I've been trying really hard to breastfeed however i feel i have low milk supply because whenever i pump its around 20 to 30 ml only. Seems like it's not enough for him and that's why i combine it with formula milk now to ensure he is getting enough. Did any mummies have this issue, if yes how did you manage it? Im also taking fenugreek supplements, pumping frequently but nothing seems to work. What is the optimal volume of breastmilk which i should have week by week as baby is growing, any idea? #advicepls #pleasehelp #firsttimemom