I did a unprotected sex with my boyfriend and took Plan B within 2 hours. My periods came on proper time which was on 11 august. pain and symptoms was normal but the flow was like 5-8% as compare to my normal periods and the color of blood is little brownish. I don,t know whether i got period or what because I drank a lot of coffee and took a lot of vitamin c to get my period on time or before time. Can somebody please help...