17,made out w/ a guy yesterday,we fooled around but didn't have ,im scared i might b preg, wat sld i do?

so as i said im 17 i made out w/ a guy yesterday. we fooled around and rubbed agianst each other and now im afraid im pregnant. what should i do? im scared and can't evern tell my grandparents iv made out w/ a guy, let alone pral and rubbed agianst each other. i can't ask him if he soermated that would be weird. i don't think he did but how can i be sure? im so scared and iv been praying like crazy b/c despite my curiousity im a christian who is now scared shitless! help please anybody!!!!!