hi. I had cold last week (July 9th) and it was very bad cold so I had to take antibiotics which is clarithromycin. And I'm also taking Yasmin pills(21 days) . But I finished taking clarithromycin after 5 days .it's my 4th day break taking Yasmin and still no period , I'm worried and thinking that Yasmin didn't work at all these past few days . Should I stop it and wait for my period???