<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, may I answer your health queries right now ? Please type your query here...I am 18 weeks pregnant...took a z-pac last week for a terrible sinus infection was done with it on sat. my doc prescribed it to me. I just started porgesterone shots to prevent pre-term labor. I have noticed that my tongue is yellow and has been for about 5 days. When I brush it it goes away but then comes back the following day. At night I still have a very congested head nose and now have a very sore throat. What is wrong?  <response>: Hello, I have gone through your query and understood the concern. Your symptoms suggest that you have a persistent infection. The antibiotic seems not to ave cured it all. The discoloration of the tongue may be secondary to antibiotic usage andor due to other medication or food intake. If it is a fungal infection, it is not so easy to remove it with rinsing. You can ask for a throat swab before deciding on using another antibiotic. Meanwhile, you can try steam inhalations, warm saline gargles and Chat Doctor. Avoid all cold food and 