How Many Days Before Menstruation Should Primolut Be Taken For Postponing?

Hi please can you help i was prescribed primolut nor 10mg and i want to delay my peroid, my peroid is irrugular lately, comes a week earler each month. it might come around the 13 th or 14 of november, and i want to delay it after the 23 or 24 of november, cuz i will travel with my husband and need to romance abit. when excatly i should take it and for how long and how many times per day? and will there be any bleeding during that time? please help me...thanks