Breastfeeding Problem

How long does it take for breastmilk to leave your boobs? I recently switched my 2 month old to formula because I thought I wasn’t producing enough milk, well now I’m thinking he was cluster feeding and I didn’t realize... it’s been almost a week since I switched and id like to still breastfeed him if I can or at least pump to continue on that end but now I don’t know if I’ll have enough anymore because it’s been so long... no one in my family and or friend group has ever breast fed and I recently moved so I haven’t found a dr. In my area yet that I could ask. Any advice with the direction I should take would be wonderful. Thank you all!