How do I get rid of these fleas!

So I have two ferrets that live in my room. and i scrubbed down my room. and sprayed flea killer and washed all my bedding and their bedding. And I vacuumed everything. But yet the fleas are back. I have only see two. They aren’t really on the ferrets or my cats, but they are living in my bed… I have no clue how to get rid of them. Please help me!