hi Dr. i am taking progyluton medication since may 2015. however, in course of taking the white medicines, i accidentally took a brown tablet one day while i was on the white tablet schedule. from the next day i continued with the white tablets again. (my Dr. asked me only to take the white tablets). now after 4 days of completion of my white tablet schedule, i have started my periods from yesterday 13th june, 2015. this is very untimely, as my periods were due on 26-28th of june, 2015. what does this mean?