Brown discharge after 6 days of coitus has little to do with coitus. If bleeding is caused by coitus, it usually occurs at the time of coitus, including the morning of the next day, and will not be separated by such a long period of time. Brown discharge also does not suggest the existence of pregnancy, because even if the coitus was conceived, will not exist so early in the time, if there is bleeding in the implantation, usually in the pregnancy of more than 30 days or so, will not exist after 6 days will be implanted. Brown discharge to rule out whether there is a physiological reason, if it is ovulation, it will also stimulate the endometrium to cause a small amount of bleeding. At the same time, if there is a brown discharge before menstruation, also suggests that there is a lack of progesterone secretion, caused by luteal insufficiency caused by brown discharge, then you can also go to the hospital for a blood test of hormone six, including ultrasound need to stop the bleeding treatment.