I currently take ocella. my doctor told me if i do the first day start (taking the pill starting during the first 24 hours of my period) so i tried it. i have had my period since friday and it is now tuesday night..how long do periods usually last when u take it the first 24 hours of your period? im used to very short periods and when i did the sunday start last times i was on the pill my period would stop once i started taking the active pills.