What Causes Vaginal Bleeding And White Discharge After Using Pills?

i had unprotected sex last month on th 20th. i took the unwanted72 within 3 hours. After 8 days i had bleeding for thee days. was it my period or what was that. since three days i had white discharge from my vegina . will i become pregnant? i will never go for such pills again. i am so worried, please help me