I am 25 years old, I have been taking birth control since I was 18. I skipped 3 days of pills (a weds, thurs, and friday) On Thursday we had sex and he came inside of me, on Saturday we had sex again and he pulled out. The first timd we had sex was the 24th of the month and the 2nd was the 26th of the month. The first day of my last period was the 14th of the month. I am also taking an antibiotic that lessens the effectiveness of the pill. What are the chances that I became pregnant?