I not on birth control and while my boyfriend and I were having sex some how the condom came off without both of us realizing. We are not sure when it came off, before or after he finished. This was around 12:30 at night and the next morning around 10am I took plan b. I am 19 years old and as much as I love kids, I am not ready for a child. I am very worried about the chances of pregnancy. I was wondering how effective plan b is and how much I should be stressing over this..My boyfriend and I are very very scared and wanted to try to find an answer of how worried we should be. Any information is helpful, thanks!