i had my menstruation twice for this month..first was last jan.4 which lasted for 5 days and the second was this jan.22 for 4 days.. this was the first time that i experienced having my period twice for this month..is this just a side effect by taking pills because i took 2 pills last jan.17 and after 5 days i got again my period..im curious why is this happening..pls help..thanks..