What Causes Discoloration In Menstrual Flow With Sore Breast?

At the end of March, beginning of April I got a dark brown tar like period, concerned, i took a pregnancy test and it was negative. Two weeks later i got a very light period for about 3-4 days. one week to two weeks after that i got a very light pinkish discharge. Once again i took a pregnancy test and it was negative. At the beginning of June I took another test and it too was negative. It is now July and I still have not got my period. Other symptoms I have been having are throbbing pains in my ovaries, headaches (which are rare for me), weight gain, knee pain, sore breasts and also my legs feel tired.

Please Help!