Would love opinions- implantation or strange early AF?

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!