I missed my period in Feb of this year and had a brown discharge a month later. When I went to the doctor he told me that I just didnt ovulate for that month.
i agree go to your doc and see maybe get your hcg levels checked as some urine tests dont pick up low ammounts of hormones so a bllodtest would be more accurate xx best of luck xx
just a thought but see your gp because the dark brown discharge is a symptom of an eptopic pregnancy, i had this and negative HPTs and i had no idea that i was pregnant let alone had an eptopic one. It went undiagnosed until i collpased so i suggest as its been 4weeks just get checked out for peace of mind xx