Im not saying this is why, but I think it really messed with my hormones...I took it back in sept and all of a sudden I got my P in Oct on time (mine never come on time) then in Nov I found I was preggo. I took it the very next morning too, so if you continue to be sexually active then make sure you use protection.
My boyfriends sperm got on my vagina. We didnt have sex but some spilt. im not sure if it went in. That was 13 hours ago and i just took the plan b pill. Im still pretty scared
It is 75% effective at preventing pregnancy.