As such symptoms of swine flu
are similar to those caused by other influenza viruses. These include fever and chills, coughing, sore throat, running nose , lack of appetite and fatigue.
As such pregnant women are at higher risk of geting infecting swine flu.
For further reading-http://www.cbc.ca/health/story/2009/07/29/swine-flu-pregnant864.html
To reduce the risk of catching or spreading the virus you should take preventive measures which include
-cover your mouth and nose when infected person is coughing and sneezing, using a tissue
-throw the tissue away quickly and carefully
-wash your hands regularly with soap and water
-clean hard surfaces (like door handles and remote controls) frequently with a normal cleaning product.
As such if he has only cough and not having any other associated symptoms then there may be possibility of Bronchitis in his case.
He should be seen by a pediatrician for further evaluation and management.
It is advised to consult your Obs/Gyn doctor for your foetus well being as well.
I hope this helps.