Implantation

So I am normally on BC Pill but for the past 2 months I haven't taking it consistantly... However i missed my pill when I was fertile and ovulating... this was 10 days ago that weekend I had unprotected sex. So on Friday March 22nd I like very minor cramping then spotting which was brown for three days (Friday, Saturday and Sunday) Today its brown but a lil bit more... this doesnt feel like my period because by now I be very heavy and thats not the case. I been feeling very diffrently this weekend and My period isnt due till Friday March 29th.... Is it possible I have implantation bleeding... there is a chance I can be pregnant because of me not taking my birth control... plz help