Breastfeeding problems 3 weeks postpartum?

Sorry in advance - long concerned mommy post!!

So, I had our little man 5 weeks early & he had to stay in the NICU for almost 2 weeks. Due to this I had to pump for that time while in the NICU since he was unable to nurse due to complications. My milk came in great, I actually had an oversupply & got engorged multiple times during the first 2 weeks. I have a decent little freezer stash due to this! We're a few days shy of 4 weeks pp, & little man does great nursing.

I have noticed that my supply has DRAMATICALLY dropped in the past week... :( I would easily nurse AND then pump 6-7oz total right after nursing. But now I nurse & struggle to get 2oz total right after...

I've heard this is normal, as my body is now starting to produce just the right amount that he needs daily. I have a 2 1/2 yr old toddler, & have them both by myself for ~12hrs at a time while hubby is working. I'm eating healthy foods, drinking a sufficient amount of water daily, taking daily Fenugreek Extract/Blessed Thistle/Fennel Seed/DHA supplements, & eating lactating foods. I also nurse at least every 2-3hrs during the day, 1-2hrs during the night (baby is a milk drinking machine during the night), & still pump periodically through the day w/ my hospital grade pump. This discourages me to no end...

I just feel I should be making more milk! I know little man drinks enough because he's gaining weight like crazy (pediatrician is very pleased w/ his weight gain) & is having regular wet/stool diapers through the day.

Have any of you mommies had a drop this early in your supply & were you able to bring it back up?!

THANK YOU in advance for the support!