My baby turned 4 months old today . I absolutely love breastfeeding!

About 3 weeks ago my milk supply went down. I was pumping 4-6 ounces every 2-3 hours. Now im pumping every 2hrs at work

Between 9am-4pm (7 hrs) and I’m only getting 10-13 ounces in that time frame Is it because my milk supply regulated and I’m only pumping that much because that’s all he needs? He goes to daycare currently from 9am-4:20 and they’re giving him 4.5-5 ounces every 2-3 hours. My left boob is literally only giving me an a ounce if any maybe even a half a ounce. Or could this be due to us having a yeast infection 3. Weeks ago- the pediatrician prescribed nystatin and I have used it on babys bottom And on my nipple . My left nipple was painful to the touch and very sensitive and hurt really bad when I nursed. It has since. healed but I still get tiny pain if I pump on my leftBreast or latch him on which I barely do because not much milk come out . Could my left breast be infected still and lost the milk supply. ? I’m finding myself having to pump atleast 6-7 times a day which I believe is a little extreme. I only want to pump when I am away from him being as though I only have one good breast that produces milk! Any advice on this please helppppp