My "period" started 5 days early, which is shocking for me because I am usually a couple of days late. That morning I had some intense cramping and very little spotting through out the day (only half a tampons worth). When I woke the next morning my tampon was completely full. I have changed it only once today and my bleeding has subsided to just light bleeding or what I consider spotting since I normally have a very heavy flow. I have only needed a panty liner for and there is barely anything on it, just pinkish brown blood when I wipe.
What could this be?