Suggest Methods To Delay The Periods

I am 17 years old. I had menarche at the age of 12. Since then by God s grace I had normal periods with fixed dates. I never had to take medicines for any reason. But now due to some occasion I need to delay my periods for 10 days. But I am having a doubt that. .... 1. Will delaying pills be effective? 2. Can it delay periods for 10 days? 3 . Will it affect the flow and the date afterwards? 4. I am from India. So can you tell me the name of the medicine that can satisfactorily fulfil my wish?