Bleeiding after taking Plan B?!?

Me and my bf were having sex, and yes we used a condom. However after we were done we noticed it had ripped. So right away we went and got Plan B. I took it on the first day of my fertile window. Now maybe like 5 days later I am experiencing a lot of bleeding. By a lot of bleeding i mean it is like a heavy flow. I also been experiencing similar pain to when i get my periods, and that would be like aching or soreness on my vaginal opening. However, i do not have any abnominal cramps, which i normally do get with my periods. Ive also been having the urge to pee but then it is only a few drops, and after like a minute i will have the urge to pee again. Ive never had spotting so idk if this could be spotting or what is going on with my body. Anyone had any similar experiences? Is this normal?