Implantation bleeding? Or something else?

Amber
My fertile window is supposed to be over by this week, I never caught a lh surge after testing for multiple days (my first cycle through so my fertility window keeps adjusting). Just about twenty minutes ago, I went to the bathroom and as I was wiping I got the smallest amount of blood. It almost looked like a very tiny clot, but AF isn't due until Oct. 5th. I have had some slight pain on my lower right side, but no test showed a surge and we've been BD-ing every day, if not every other day, the last time being around one in the afternoon on the 19th.