Hello, Thanks for trusting us with your health concern. The most likely cause of the delay in your menstrual cycle is the excessive use of emergency pills during the cycle preceding this. Please remember that the emergency pill contains high dose of progesterone which alters the hormone milieu leading to menstrual disturbances like withdrawal bleeding and a delay in the next natural period by a week or two. The pill should be used only once or twice a year due to this reason. As you have taken several pills in the same cycle, your hormone disturbance will be exaggerated. Please see a specialist for further management. Use regular contraception in future. Hope this helps.