implantation bleeding

anyone ever experience late implatation bleeding? my period was due 11 days ago, when my period was 6 days late i had pinkish discharge only when i wiped and a little brown. i had no cramps and ive been having headaches and nausea lately. when i usually get my period its super heavy and im in alot of pain. remind you, my period has never been more than 2 days late in my life, and is super regular, thank you!