I don’t think I’m making enough milk

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4 days pp I got my milk was really engorged. I was pumping and breastfeeding. My baby this week my baby is waking up every 15-30 mins hungry. I’ve been breastfeeding all day for 30+ min at a time and she’s still hungry. I don’t think she’s cluster feeding because it’s been 4+ days of this it’s 24 hours as well. I today to give her formula because I got to a point of being to exhausted to feed her (I’m a single mom). She will go to bed with 2-4oz of formula. I stopped pumping because I was breastfeeding so much but I just tried again and I used to get 4oz in 15 now not even 1oz. My baby is 3 weeks. Plus I noticed this week my breast are so deflated never engorged I could go a full day without any feeding/pumping (my parents watched her) and nothing. What can I do?

I literally am typing this as I breast feed for an hour and she’s still trying to eat her hands and pjs. She’s latching great and everything so I’m confused.

Example of what I used to get for 2 weeks straight

If this is cluster feeding how can I manage this it’s just me, I honestly haven’t been eating well or often enough at all because she’s been constantly wanting to eat even after she falls sleep. Going to be almost a week of this. I don’t get to switch off with anyone and this is 24hrs a day.