Repost: Please answer I need suggestions?

I took a plan B pill on October 24th and I had an off and on period from Oct 31st until November 10th. My periods only last 3 days. I started my period on November 30th again and I'm still on it, and today I felt a twinge of pain in my lower abdomen(I've experienced this with my first 2 kids). Since I took that plan b pill I don't when my cycles are, or even ovulation. I had on November 18th which would've been a high ovulation day for me, but didn't have again until November 27th. We don't really use a method of birth control unless pull out method is considered one. But I don't think I'm pregnant because I didn't miss a period. Have any of you taken plan b? Did it make you this irregular? How long did it take before you were normal again?