TMI picture but please respond! Implantation question.

Kattie

So this is going off of my last post. Sorry to be annoying 🙈but it's just about that time that everything is a "pregnancy symptom" lol. AF is due on the 23rd. On the 15th and 16th I had really really light spotting, only when I wiped. Today, the 17th, I didn't spot during the day, but tonight there was this...(picture). What do you think is happening? Implantation or my body getting ready for AF? I have no idea when I ovulated this month.