Suggest Remedy To Avoid Possible Pregnancy

yesterday me and my boyfriend were making out with our underwears on then he cum on my underwear and i felt wet it was near my vagina i am 18 and it was day 14th day after my period i am afraid i might be pregnant i am a virgin and it was my first time to make out yesterday and also i want to know if its possible to get pregnant how can i avoid it should i take pills or what?