could i be pregnant ?

so i’m taking birth control , i’m good with taking it i haven’t missed a day since about a month ago and i take it everyday at the same time ( 8 pm ) - but on saturday ( the 19 ) i took my pill 30 minutes earlier than usual. i had unprotected sex( on the 20th ) and he did finish in me i was wondering if i had a big chance in getting pregnant or am i just overreacting