My LMP was 10-4-16 to 10-10-16. I had unprotected sex 10/14/2016 he did not pull out. I had started taking BC pill 10/12/2016. Well last night 10/22/2016 I was bleeding very very light and today I'm bleeding more it looks like period. But my period isn't due till Nov. 2nd. What can this be ? Can it be implantation bleeding ? Can it be a early period? Can it be because of the BC pills. Please some one help me try and figure this out. I'm bleeding like it's my period :(

P.S my periods are regular