Too early for implantation bleeding?

Kr

Hello,

Sorry for the tmi post. I have a 23 day cycle, 4/5 day period. My period started on October 10 and ended October 14. Today October 17 when I go to the bathroom and wipe there's a little bit of pinkish blood? I did BD on the last day of my period(14th). From what I have read I see implantation bleeding, ovulation bleeding, and irritation bleeding from intercourse. I've never experienced this before.

What do you all think?