"plan b one step really works. i know you&#039;re probably nervous and worrying about the effectiveness, but i just want to tell you to relax. let me just tell you my story, i had sex february 4th and the condom broke. so me and my boyfriend drove to the pharmacy and purchased the plan b one step. i took it, so it was about 20-30 mins after the incident happened that i took the pill. i began to feel one symptom about 1 hr later, i was extremely tired, and had little energy. it lasted for 2 days then wore off. so i was expecting my period about a month away so i went crazy. i missed one period and finally got my one 12 days after my missed period. so plan b actually works."