Fenugreek and blessed thistle

I have been taking fenugreek and blessed thistle for a few weeks due to low milk supply. I'm pretty sure I have had good results as I haven't fed my baby any formula for a few days and he seems fairly content with just being breastfed. Now that my supply seems to be ok can I stop taking the supplements or will my supply drop? I really want to breastfeed but I would like to not take so many pills (I'm taking a total of 21 a day!)