I have missed my period by 10 days. Did pregnancy test 4 times in these 10 days but it is negative. Even went to a doc and they did my blood test- that too negative. My hb is a lilttle low and doc gave me progestrone tablets for 5 days. The 5 day course is over but I have still not got my periods. I am worried. Last month was stressfull cause of exams and I had brown discharge before my due date. What could be the cause? Can it be chalmydia?