Primolut N mobile apps is a platform that is intended to help women to calculate a schedule for regulating their menstruation period postponement. This apps is not intent to substitute physician consultation. This apps provides the calculation system which give recommendation when the women should take medication according to expected menstruation postponement day through pill reminder when they should take medication based on doctor recommendation. In order to have accurate result, they should input the information about their 3 latest menstruation period and the expected menstruation postponement day to calculate the day when they should take medication .