feeding problems?

My LO is one month old and I have been having low milk supply issues. She feeds on demand but wasn't gaining back her birth weight so her doctor asked that we supplement. She was 6 lbs 5 oz at birth 5 lbs 9 oz at one week and 6 lbs at three weeks. I agreed to supplement but spoke to a LC about the best way to do it and I am taking fenugreek and blessed thistle. I pump between feedings and try to use that to supplement but I only originally could pump one once total and can now pump two after starting the vitamins three days ago. I just increased from 2 pills to 3, 3 times a day today. Also today my supply was back down to one once for two of our feedings. I always offer her both before supplementing. I know a lot of people seem to be against supplementing and think it is the problem but I had this problem when I was not supplementing and at least now my LO is satisfied after eating instead of tugging and pulling at my crying constantly from being hungry. My question is has anyone had or heard of this low of a supply increasing enough to satisfy their child or will bottle feeding be in our future?