The last 2 menstrual cycles I've had have been about 40 days long. I started my period on November 26th, and according to my timetable, I'm not expected to start my period until January 6th (40-41 days). On December 24th, I noticed I had a light brown discharge/spotting. But it's been off and on. Comes and goes daily. I am familiar with brown discharge, as I normally have 2 days of brown discharge before my period, but this has been going on for almost a week, and still no period, just a very light brown discharge every other day? What could this be?