He pulled out, is it possible to be preggers?

So he didnt use a condom and im not on birth control and he pulled out lik 10 seconds(more or less) before he cam. Were 17 so yea were probably really dum for doing that.(i no). also he cam on me and it was everywhere i dont no if he got it on my . but is there a possibility of being pregnant that way too. and i also read that ur most likely to get pregnant 14 days after your 1st day of your period, and thats exactly when we did it. so is there a chance or should i not be worried about it. caus my friends jus said not to worry about it but the more i read the more i think i should worry. i dont know. what do you think?