Sorry, but it's too soon for implantation bleeding. Doesn't mean you haven't conceived, but it's way too soon to have any symptoms even if you did.
It would be way to early for implantation bleeding sorry. Wait an see if you miss your period.
It was more likely spotting to trauma to the area from intercourse. Implantation bleeding takes a few days to occur, even up to a week or so. You can still be pregnant though so good luck!