TB question...very worried!?

I was exposed to a patient who has tb. I feel something around my nasal cavity, pharynx or somewhere further back. It was a closed room, and I'm not so sure how tb spreads. Can it spread through out the room if the patient had a breathing mask but not through out the entire time? But when I walked in he did. I... show more I was exposed to a patient who has tb. I feel something around my nasal cavity, pharynx or somewhere further back. It was a closed room, and I'm not so sure how tb spreads. Can it spread through out the room if the patient had a breathing mask but not through out the entire time? But when I walked in he did. I had a mask but it wasn't tight around my face. I'm really concerned because I don't live alone. I don't want to panic if it isn't such a big deal. I feel that I am being paranoid but then again you never know. Since I don't know much about tb it really does concern me. How soon can you get it, and how soon can you feel the symptoms?
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