BM supply dwindling

Yesterday was the first time I've pumped since my LO was a few weeks old. Recently had his 2 month appointment and he is right on track for growth and weight. But I only pumped an ounce out of each breast. I feel like a failure and I've been taking all of the fenugreek and blessed thistle that I can tolerate. I havent been drinking as much water though. I feel like I'm failing my baby. My goal is to breastfeed for at least 6 months. But now I'm terrified that because of my own fault I wont be able to do that. I only supplement with formula once or twice a day, just because he is still hungry after feeding. I know supply and demand is how this works so should I stop supplementing all together? 😫