13DPO and STILL spotting

[Chi829]

HI all. Well, here I am. 13 DPO. Negative FRER this am and AF was supposed to show today. I have had very light brown discharge since 9DPO. I thought at first it was Implantation bleeding but it's been 5 days of it now. Not even enough for a liner, it only shows up when I wipe? No sign of AF yet. Not sure what to think,,,,,,,sore boobs are gone now,,,,