Hi team! Would love some opinions on what’s going on for me this cycle.

My AF is always very regular and always comes on full tilt and very heavy-no days of spotting before hand.

This cycle, 11-13dpo I had 3 days of dark brown discharge, 14dpo (day AF was due) there was more brown discharge and a small amount of pink blood but not enough for a tampon- it was only visible when wiping. Today is 15dpo and there’s nothing!

Is this implantation bleeding or a weird early and short AF? Would love opinions as this is totally bizarre for me!