if you don't get bite marks does that mean you don't get bitten?

Hi there
I keep seeing fleas in my room, the cat never comes in my room and we are the treating the cat accordingly. However I don’t understand why I am seeing fleas in my room, as I never get bites. Or am I getting bit and I don’t know it? I have no marks whatsoever on my ankles etc… would really appreciate an answer as I am very confused!
many thanks
Kate