implantion or preparing for fertile window?

was Suppose to start monday-thursday (past 5 cycles been have been 27 days (which is my average which would have been monday) thursday would have been my longest cycle day). took test monday (day 27) and got a neg. started latter that day. monday was light. tuesday-wendsday was heavy with dark blood and clots. changed pad (over night kind) a few times (4) friday was light. im not suppose to be in fertile window untill this coming wensday but my breast/areola area and chest wall feel bruised and heavy and my cm is really wet/watery/see through to very litttle creamy/milky.