Hello Doctor... I have regular cycles every 26 to 30 days usually with bleeding lasting for 4 days... My previous two cycles have been 30 days apart, with menses starting on the 20th of the month.. However, as I'm getting married on 23rd of next month and we have religious functions starting on 19th itself, I would like to know how I can prepone my next cycle so that it ends before 19th... Thanks in advance