Could The Early Menstruation Be Due To Norlevo Pills?

i took norlevo couples of hours after we had sex with my boyfriend. then after 1 week had bleeding for 3 days...after 3 days the bleeding becomes heavy for 9days.. and i'm expecting my period 1 week from now... is this a side effects of norlevo or my period begun.. i feel worried that this is not normal...pls answer and thank you very much!