Home remedies for a cold

I’m scheduled for a C section on Friday. This afternoon I’ve started feeling as if I’m coming down with a cold. I would like to try some preventative measures to prevent an onset or home remedies that are safe during pregnancy to speed recovery before friday. I know to drink plenty of fluids and rest as much as possible. I’m going to take some Benadryl, Tylenol, and use a saline nasal spray to help ease the symptoms. Is there anything beyond that? Are there some good herbal teas that may be beneficial? Any suggestions welcomed and appreciated.