what are the chances i end up pregnant ??

** don’t bash me ** i started my antibiotics three days after i had sex without a condom ( he didn’t finish in me !! ) . i’m supposed to take my antibiotics in the morning and at night . i took them the night of the 30th ( cycle day 15 ) . i forgot to take them the morning of the 31st but took them that night . the night of feb . 1st ( cycle day 17 ) , my boyfriend wiped his pre - cum off and got in three strokes at the most and immediately took it out . there was no pre cum present . i then started back taking my antibiotics last night ( feb . 4th ) and took them this morning and tonight . i had sex with a condom tonight and checked for holes and there were none . what are the chances i get pregnant . i’m also on birth control and take it religiously every night at the exact same time .