Hello! I was on birth control for 3 years after my daughter was born and stopped taking it aug 2013 as we would like to try for another child. It is now may 2014 and I still haven't had a period. 3 days ago I started brownish spotting and then went a little red and back to brown and now it seems like its over with. Obviously this isn't my period I wouldn't think and I took a test and im not pregnant. What could cause this? Should I be worried?