I want to delay my periods for next month only as I have to go on a religious trip. This month my period start on 17th. I have irregular period.in some month it happens 10 or 7 days before.in some month it will delay by 3 days.In some month right time. So I am not sure when to take medicine. Next month may be 16th oct the date or at what time I will not sure. So before how many days I should take medicine and what medicine? How the medicine doses will be? How many days will it delay? Is there any side effect for that? Please suggest me what to do? Thank you in advance.