What Does Light Bleeding Well Before The Periods Indicate?

i had a sex with my partner last to last sunday n i dont even know properly dat his sperms had entered my vagina properly or not but for a precaution i had taken i pill n then last sunday we had a fingering n on monday i started bleeding n my periods should come on 17th n now its too early is bleeding due to periods or masturbation n its still continuing
n bleeding is also very less bt in periods i generally have huge amnt f bleeding wt shud i do m confused a lottt