Brown vaginal discharge
is most often associated with old endometrial tissues. In other words, if your period is late you might get a brown, rather than red, discharge. It could also mean that for whatever reason during your last menses the entire uterine lining failed to make a timely exit.
Other reason could be due to miscarriage or ectopic pregnancy, vaginal infection
, placenta praevia
in lower part of the uterus), or placental abruption
(placenta beginning to come away from the uterus. You should take rest and report this to your doctor. To confirm the status of your pregnancy, you can get a serum HCG test done which is more specific than a urine test.
Hope it helps you. Regards.