What Causes Mild Bleeding And Cramps Post Non Penetrative Sex?

hii day before yesterday i.e friday 13th may me and my bf had a normal foreplay with out any intercourse but i did give him blow job. And while he was fingering me i noticed blood in his finger. then the next day i.e 14th i noticed brownish pink discharge and later i experienced cramps the way i have during my period and also my period date is due on 16th or 17th. and from 14th night around 8:00 i m bleeding and the blood is dark and bright red and there is no more cramps.. also to be in safe side i was willing to take emergency contraceptive pill incase anything had happen which i dont remember but now that m bleeding i dont know whether i should take it or not. what should i do i need help asap plz : ( and also i want to know if i take it when will be my next period or this month period.