What Causes White Discharge After Having I-pill?

i had unprotected sex after six days of my periods and took i-pill next day. from next day i realized i am having white discharge from the vagina,it continued almost a week and then it's color changed to brown for two days color was brown from third day color turned bit red but not that much like fresh blood today is the forth day, but i am not getting it like periods it's very minimal. i am scared.......plz help, what it could be????????