genital rubbing and cum on vulva, am i pregnant?

so long story short, my boyfriend and i did some raw genital rubbing and he ejaculated on top of my vulva (around the clit). he wiped it off but im not sure if some cum came into contact with the opening. what are the chances of getting pregnant this why? i am also worried about possibly getting pregnant through pre cum. 

we've never had piv sex since i'm still quite scared of doing it. but my last period was 58 days ago, so i am overthinking. i do have irregular periods with really long cycles (longest was like 64)