Breast feeding help....

I have pocos and after 6 years of trying we finally had our son 10/09/16. I was told I would have trouble breastfeeding due to the pocos but I did everything I could. I tried drinking extra water during the day, mother’s milk tea, pumpkin seeds, lactation cookies and countless other things. My milk supply was simply not enough for him and I had to begin supplementing with formula. After 2 1/2 Months I went completely dry and had to formula feed my baby. I am now 29 weeks pregnant with my little girl and I’m afraid I won’t have any milk for her. My breasts haven’t firmed up or anything! Should I start trying to pump milk now? Should I try all of the lactation methods starting now? Has anyone else gone through this?? Any advice would help. I just want to breastfeeding feed my baby and I’m so afraid I won’t be able to. 😔