Would i get pregnent?

Last month my boyfriend and i met and he was fingering me. i gave him a blow job n nothing actually went into my mouth as it was dry n imade sure i gave a blowjob again only when it was dry. and he was fingering me. n this month i still didnt get my periods on. I am worried. is it because i gave him a blow job and something of him went into my mouth but i made sure when i was done with the blow job i spitted out even if nothing came intomy mouth. so is this the reason for my periods didnt ccome? or is it because he fingered me? or something else? plz help me out im worried :(