Hello all... I need a little help.

Last Monday I felt cycle cramps... BAD! However I wasn't scheduled to start my cycle until Friday. Friday came and I began to have slight cramps and very light pink spotting. Put on a pad and when I got off work at 11pm it was nothing there. All day Saturday it was very light pink no cramps. Saturday night until Sunday no pink nor cycle nor cramps at all. Sunday evening I begin to see pink again and put on a tampon but I'm not even filling it up as if I would any other month. Mind you I am REGULAR! EVERY 28 DAYS! Lol This is weird.... Anyone experienced this before... Could I be expecting? Implantation bleeding perhaps?
Re: Light bleeding....