So I Had Unprotected Sex On One Of My Ovulation

So I had unprotected sex on one of my ovulation days, did not realize until after I checked my calendar. I took the morning after pill 2 hours later. For a couple of days I experienced cramps and tiredness. A week later I woke up went to the bathroom and had extreme vaginal bleeding along with stomach cramps. Is this normal? Side effect of plan b?