So, this month i have been under a lot of stress ( in second part of cycle had two major exams week and half ago).I think i ovulated regularly, but my period didn`t came on time( it has wacky schedule, if you could call that schedule, but it was never late for more that 6 days, except for once-few years ago i had pretty big cyst on right ovary- 22 days late with severe bleeding), with today(wednesday), it is 8 days late , and in monday morning i noticed dark brown/rusty discharge which continued yesterday and today..I am sexually active(we always use ex. safe condoms) , but am not pregnant (took three tests -last monday- period due, friday-4 days late tuesday-week late and every one turned out negative), but just the thought about being late/possibly pregnant is making me anxious and even more stressed. I am not using the contr. pills, but am thinking of starting, since my menstruations are pretty heavy and extremely painful(so painful i get really nauseated, vomit, shaky legs, cannot walk properly, paralysing pain in lower extremities ).This mnht i hand no or very little PMS symtoms and after , being late i have none(no sore breast, nausea, tiredness, lightheadedness, ), except for cramping with the brown discharge and reduced appetite . My boyfriend and I are clear of STD`s ( mutually exclusive relationship).I do not want to be pregnant, but could i be even with three negative tests (two clearblue tests and one other brand)? Or could it be ilness ? I read that brown discharge is usual in women who had late periods , because the uterus was unable to discharge of endometrium(uterus lining ) on time . WHat is your opinion ?