I was in a room with somone who has tb and they was coughing will i catch it?

Unlikely-get checked: TB is rather difficult to contract. It does not survive easily outside the body. However, if someone has active TB and is not under treatment and is coughing then criteria for transmission has been met. However, I would be skeptical that someone who knows they have TB, is untreated and out in public coughing. In any case you may need to have a skin test and be checked in follow up. See you Dr.