pregnancy scare

i had sex a day after my period ended but it was protected. and the next day i got drunk 2 days in a row and had a hang over. ok only reason i’m scared i might be pregnant was because today i had very bad chest pain & back pain n i feel sick. but i don’t know i’m scared 😭 the condom didn’t pop either that i kno of , all i can do is wait for my next period . idk if i’m sick from drinking or pregnancy because it’s the same symptoms