I don’t really think this is related to OPs problem.In your bedroom?! Take them out at once. Baby chickens also can carry mites and I am speaking from experience. We raised our one day old 15 in the kitchen and by week 3 we developed an itch and mini bumps on our skin, we got chicken lice and believe me, you don’t want that problem right in your bedroom. Needless to say our cute chickens were transferred to the coop ready or not.
Mites are transferred from outside and other birds with it. I’m pretty sure you would have had other birds with it to begin with for that to happen.
Anyway, maybe lets focus on treating OPs bird instead of a possible mite problem that probably won’t happen.