Precum? TMI ALERT

A day after my period, me and my boyfriend played with each other.. I hand-j and bj his private part and after a few seconds/mins, I touched the sides of my vulvar region (pubic area on the sides)

(Note: I just started tracking my cycles and it ranges from 33-37 days. I was also wearing my underwear with a napkin/pad that time. No intercourse happened, his penis wasn't rubbed nor put near my vagina, never inserted any finger, just touched the vulvar region)

If there was some little to almost dried precum on my hand/fingers when I touched my vulvar region, can the sperm swim from the outside into the vagina? (I know this question is kinda silly but we lack sex education in our country)