effectiveness of the pill

ok so i just wanted to know if there’s any chance of me being pregnant. i had unprotected sex with this dude on friday and he finished inside of me. i’m on birth control so i know the chances are very slim. but the day before i hooked up with him, i took my pill at 4 pm when i usually take it at 6:30 pm, and then the day that i hooked up with him i took it a little after 9 pm because i was at work and forgot to take my pack with me. but today is sunday and i just started my placebo/inactive pills. i’m typically pretty good at taking them on time but there have been a few days where i take them late so i’m just really worried about the effectiveness. i’ve also only been on the pill since the beginning of december. any feedback would help ease my mind!!! i really need reassurance because google isn’t helping.