How often is your AI credit balance updated when you use AI features?

I'm using Photoshop 27.2 and using the generative expand feature. I have used it multiple times on multiple photos and saved the images back to light room. However my AI credit balance has not decreased. I have also used generative fill to remove objects and it is also not affecting my credit balance. According to the documentation both of these actions should've reduced my credit balance by three credits each time.
I have the photography plan which includes 250 credits per month and I have an additional 2000 credit plan.
It's not that I'm dying to spend more credits it's actually that I'm just trying to understand and confirm which features use credits and which do not.