could i be pregnant?

this is going to sound really weird but me and my boyfriend had unprotected sex but he pulled out on time and he cummed on my thigh so i had him clean it up with a tank top of mine later when he left like 10 mins after i cleaned myself up but i forgot that tank top had cum on it and kinda whipped myself with it... i haven't had my period for 12 days and i was supposed to get on a monday... is it possible that i could somehow be pregnant or am i stressing myself out to the fact i haven't gotten my period??