I am on birth control (28 day) but i believe i took my very last active pill late by 3 hours (day 21). i took all of my placebo pills and then engaged in sexual intercourse during my fertile window 5 days after my period. I took all of my active pills at the correct time during those 5 days except for the day i had sex, which i took that pill an hour late and consumed 2 cups of alcohol that night. what is the percentage or the chances of becoming pregnant? Will that late pill affect it?