Up until May my periods were always regular. Always came at the end of the month, I even had a period tracker to keep track. When my period was 15 days late in May I thought I was pregnant. I wasn't. My period finally came in the middle of June, it was heavy like normal. I thought everything was fine. But then it came again A week after the last one ended and that one was heavy as well. But I had taken a Plan B pill a couple days before and read that that can cause bleeding. It's been 2 weeks and today I was having horrible cramps on my right lower abdomin. Along with vaginal pain so I thought it may be a kidney infection or something. When I went to the bathroom and whipped I saw blood. I'm on my period again. I'm extremely worried because this is not normal for me. HELP!