Am i prego if..........?

Okay me and my BF had sex we used a condom and everything but right b4 his finally he pulled then condom off and *** in my mouth but some ran down his cock well he wiped it off and we put our clothes on and everything and went back home then like 20-30 mins later we did it again and he put his cock in with out a condom but then we put one on eventually .... what i'm asking i've always been told that if sperm hit the air then it dies after a certain amount of secs? so i'm asking am i prego cause if i am then i'm going to die cause im only 14 and i know what i did was wrong, and i plan on waiting a really really long time b4 i do it again... so am i prego?