needing some help.!!

Hey ladies , I need some advice.. Ive had pretty normal short periods each month around the end of the month only about 3-4 days for a while now , well I had my period March 27-30 normally , then this month it came April 15th-17th and now Im having another one "or what i believe to be another period" im not cramping or in any kind of pain . But why am I having a early menstrual cycle this month and 2 at that .!! Im freaking myself out here , can anyone give me some advice or answers ?