What Causes Vaginal Discharges Instead Of Menstruation?

Hey, m trying to concive from last 3.months however i m 33 n just recently got married.. i got myself checked out by gyny n all test come fine. I had my perieds 2 days late on first month, then next month 6 days late however the home urine test came neg. This month i m late a day but getting dump feeling n got some brown discharge from my v. Also having queef... But i m used to queefing from last 9 years while i was not sexully active. No other periods symptoms though. What i should do. Plz help