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To start. I started the 28 day pill pack december 1st and had sex on my last green sugar pill and also the next day which was sunday, and forgot to take my first pink birth control pill of the next pack. I took that first pill and mondays pill together. My boyfriend came in me both times we had sex. Also just to tell you, my boyfriend has a history of drug use heavy, as well as he was a smoker for 6 yrs still smokes sometimes when he drinks, hes also id say a heavy drinker. My question is What are the chances of me being pregnant on the birth control pill but yet missing only one pill on one of the days we had sex?? please help.