Took plan b after a scare with my ex- boyfriend and i in february. now with another guy who thinks he might have pre-ejaculated inside me.what do i do?

How long ago?: Plan B can be taken more than once. Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours. Pre-ejaculate may contain large amounts of viable sperm (less common), smaller amounts of sperm that are dead or alive or no sperm. There is potential for pregnancy with pre-ejaculate.