My last period started on December 25 lasted about 5 days then about a week or so after my period ended I started having brown discharge with an occasional small amount of blood. That lasted for about 2 weeks. I have not yet gotten my period. I did take one pregnancy test the day after I should have gotten my period and it was negative. My period was always a normal cycle until about 5 months ago then it started getting a little further apart each month. But this month, I have not gotten it at all. What could this mean? Help!!!