implantation bleeding/spotting/period

I just got off of birth control at the beginning of this month and never had withdrawal bleeding (I always skipped my placebos and have not had any spotting or bleeding for almost a year). Just now I wiped and had a little bit of blood, but then it returned to being normal discharge. Could this be implantation bleeding? I had sex 10 days ago during my predicted fertile window (not sure that I actually ovulated since it is my first month off of BC).