i had sex with my BF today, we are both 20 years old. at first it was anal then he moved to my vagina, when i felt his penis going in, i stopped him and he didnt go all the way in. i dont know if he opedned me or not and i dont know how to be sure if i am or not.. NEED HELP IN THAT PLZ !!!

i dont think his sperms went in but i did feel something. can that make me pregnant ?
plz help.. im so scared