A single red clot of blood, is this implantation?

Hello,

My period ended about 5 days ago, and my boyfriend and I didn't have intercourse on the first day my period ended. However, his precum was on my vaginal opening, and he did have during an oral.   We never had an intercourse.

And today I had a vaginal discharge of a single red blood clump of a raisin size, and there's a bit of brown mucous in my underwear. Is this an implantation bleeding? Could I have gotten pregnant from his precum or could have his sperm gotten in somehow?

PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Thanks,

Ms. Extremely Worried