Pregnancy Scares

So. I am 15 and had sex with my boyfriend, and we used a condom, which broke. We got plan B three hours later and I took the pill. However, I found out that I was ovulating at that time and on that day it was 33% fertility, and I have been told recently that plan B will not work when you ovulate. This was about ten days ago, and I have been experiencing both cramping every night at the same time and bloating for the past three days. Advice and thoughts please. Please don't belittle me, I know it was a stupid decision.