Thanks for the query.
Better to consult gynecologist and get examined to confirm the well-being of the baby.
Then with her advice take medicines to treat the infection.
Because infection in the body can cause premature uterine action and can lead to preterm delivery.
You can continue your regular vitamin tablets along with antibiotics and anti-tussive
You can try natural remedies for cold
For more details:http://srsree.blogspot.in/2012/05/cough-in-pregnancy