I work with a bunch of girls and usually always have my period when they do.  I was early the last two months because thats when the other girls started.  This last month however I had my period early and none of the other girls had started yet. About one to two weeks after my last period about the time I should be starting all the other girls are on their period and I am having horrible headaches, terrible stomach cramps where it hurts to even stand or walk (like period cramps) and light brown discharge when I wipe and just a little was in my panty liner. This brownish yellow colored discharge comes and goes. Its been this way for 3 days now.  I shouldnt start again until around the 25th.  So I dont want to take any pregnacy test yet at this time.  Any ideas what this could be?? Could I be pregnant?