abnormal bleeding of vagina

me and my boyfriend both of 16 yrs had indulged only in foreplay a week ago but to avoid complications i took pill 72.we again indulged in foreplay after a 4 days time, this time i didnt take any contraception.next day i just bled a little,but my periods are due after 15 days.
why is that so?am i pregnant?he had inserted his finger in me.

so i have my perioid. me and my boyfriend had sex the night before i got my period. but this month my period has really heavy which isnt normal i've had my period for 3 days and i've lost an abnormal amount of blood. and im peeing pretty frequently as well. what does this mean? is there anything i can do to stop it?