AF or Implantation

Lauren

I have some very faint spotting today, pinkish-brown. It's three days before AF is due. About 11-12 days past ovulation. (Took FRERs 8-10 dpo all negative, figured I was out for the month).

Thought might just be early AF, a light tampon had barely anything on it after 5 hrs.

Could this be implantation bleeding?