help! could i be pregnant?

my boyfriend was over & we both really wanted to have sex but he didn’t have a condom so we just rubbed parts. we weren’t wearing clothes and his penis was rubbing around my vagina but didn’t go in. he didn’t come near my vagina either but could i be pregnant or is it quite unlikely?? i’m also not on any birth control as i don’t want to put unnecessary hormones into my body, personal preference. :)