For those who have taken plan B as soon as possible, has it ever failed?

I took plan b like 30 minutes after the accident. I was not on breath control or anything and it was my first time having sex. The condom broke on us and I was terrified! I bled a week after taking plan b ( I guess that was my period, but it came earlier than expected). I feel very tired and feel like there is something in my stomach! I keep seeing dreams that I am pregnant. My friends tell me I am being paranoid, but I am truly scared out of my life. It has been about 4 weeks since I had my last period and I am expecting it to come sometime in the next week or so. But I hear that my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period calendar</a> may be messed up due to the pill. So at this point, I am scared out of my life. I am a student and a baby is something I cannot ever think about at this point in my life. If I was to be pregnant, I wold not know what to do with my life.  

Vote below to see results!