My boyfriend and I had unprotected sex for about a minute on October 11th. The next morning I took plan B just be safe because I'm not on birth control. The next Sunday, the 18th, I got what I thought was going to be my normal period. But from the 18th until today, November 4th, I have been bleeding. My normal periods last about five days. The flow is not heavy. It's more like spotting. Very light and most often a very dark red/brown color. I bleed most when I pee. There is no pain but I'm starting to get worried. Should I see a doctor? Is this normal for users of plan B?