TMI PICTURE! ?

What in the world is going on. I never ever spot a few days before AF. Yet here I am thinking that I am out this cycle. So AF is due Sunday. This morning at work I go to whip and have light blood. Doesn't even fill 1/3 of pad. Anyways I apologize in advance but this is so weird. I'm 10DPO, 11DPIUI. I thought it was too late for implantation bleeding. It's been like this off and on today, no cramps at all; which is also weird I would be having such bad cramps by now and heavily bleeding.