Its been 3years since Im using my contraceptive pills. My last period is on July 5. During my rest period time I was sick and have a check up with Dr. and take some medicines for cough, allergy and vitamins. This is the first time I’d experienced this kind of delay for my 3 years of using it. I used PT and result is negative. What was the cause of my delayed? And what should I do to induced my menstrual back?