Just thought I could ease the minds of some people because the internet has a variety of side effects about plan b. It can make your period early, or late, heavy, or light. For me, my period was so late I was 5 days away from the start of my NEXT period, so I basically skipped one. When my period was 2-3 weeks late I was freaked out so I took a test to ease my mind. The point is, plan b works! As long as you take it as directed you can be fairly certain you won’t get pregnant.