What medicines can a pregnant girl take for cold symptoms?

Girlfriend is having trouble not coughing every 30 minutes. Seems like a very mild case of her asthma or bronchitis acting up. She said she was cleaning the room today and encountered plenty of dust. Any advice? She had one attack which started about 4 hours after she cleaned up, lasted about 40 minutes. She watched all of a movie, then after the movie, she started coughing again. Now she is asleep. She had put some Vicks around her nose to help breathing. Is this a teratogen for the baby? What can she do to help her self at the moment? Thanks.