I Had Protected Sex With My Bf On5 Jan But

I had protected sex with my bf on5 jan but im not sure if some amount of have sprrms have entered or not .. i haave taken unwanted72 within an hour .. and im bleeding on the 5 th day so my question is fr how many days will bleeding continue and when will i have my next period as last period i had on 29 dec .. plzzz answer me soon...