pregnancy scare

okay so me and my boyfriend were fooling around in his backseat but we didn’t have sex. he was fingering me and i gave him a handjob and he came. he came on the leg of my leggings a little bit-so when i was putting on my fresh pair of leggings-i used my old pair to “clean up” myslef. so if his cum was on my leggings and i accidentally rubbed it onto myself could i be pregnant? i’ve been reasearching everywhere on google and it’s making me uneasy. i am on birth control but have not been taking it super regular lately. on the way to work tom should i get plan b even though we didn’t have sex? am i pregnant?