Plan B?

I had unprotected sex and used the pull out method along with taking a plan B the next day. I don’t think I am pregnant but I started my period and now it’s going on 8 days and the bleeding is still consistent? Like my periods are only 5 days and this has never happened. So anyone with plan B experience ,did you bleed longer on your period. I took the plan b and started my period about a week and half after that.