I am 28 y/o, regularly 25/26 day cycle for past 4 years. We are actively TTC naturally. My period was due on 2/16/08, it has not appeared. This morning, when I wiped, there was a scant brownish discharge: no cramping, perhpas a filling of "fullness," only breast tenderness, and waves of headaches....could this be implantation or my period toying with me? Thanks so much for any feedback, this is incredibly frustrating!