Prevent Flue at early pregnancy

Hi all, I would like to ask for a help which can prevent my flue and phlegm .. I'm on my 11the week and my flue and phlegm is worst.. Please help with any remedies.... Doc gave me piriton and bisolvan.. I'm afraid to consume as I'm already on Duphaston due to bleeding since 6th week.. Please advice.. Thanking in Advance.