period was 3 days late so I tested and it was negative. started getting cramps on Saturday so I figured I was starting my period. wrong. I was cramping on and off all day and when I would wipe it was a very light pink to almost nothing. on Sunday I got my regular period, heavy flow bad cramps and took pamprin. this morning it was the same but throughout the day when I would wipe it went from red to brown and my cramps gradually went away. could this possibly be implantation bleeding or am I just having a weird period?