Implantation bleeding question...

AF is supposed to show in 2 days (Monday) and I can feel her coming. My question is...when would implantation bleeding happen... is it too late for that to even be an option? Yesterday and today I wiped and saw a little blood (pink in color) but it was only the one time yesterday and today (does that make sense?) I just don't wanna gt my hopes up...Cuz I have a feeling its just mother nature calling to tell me AF is on her way....