If you had unprotected sex at night after you took a plan b contraceptive that morning? What happened was I was little bit late for 1 pill, about 5-6 hours late. I had sex with a condom a couple days later and the condom broke, so the next day I went and got plan b. That night we had another incident....How possible s it that you can concieve after taking the plan b bill only 10 or 11 hours prior??? Please help me guys, i'm so inexperienced and freaked out. And i've learned my lesson.