Hi, may I answer your health queries right now ? Please type your query here... I have started on clarithromycin 500mg once a day for cellullitis. I have noticed that I am getting a lot of flutters in my vagina. I took a pregnancy test although I doubt very much I am pregnant and it came back negative. How long will this go on for and would you advise I take another test. I have a stressful job.