Another pregnancy question please help mee!?

okay so, me nd my bf were dryin .. we both had underwear on.. he was on top.. after, i went to the bathroom and yeah i was wet.. but on the outside of the underwear i noticed an absolute miniscule stain.. so tiny and hardly noticable.. was that from me or him? i didnt think he had ne thing leak out.. can i be pregnant from this? I mean we both had clothing on nd it was very quick nd nothing went in.. please help me tho im really panicking my period tho is tmrw i dont know if that matters or if you can even get pregnant the day before.. please only comment if you have advice or ne help ..please dont write rude comments,,