What does 5 days late period and brown discharge mean?

Pregnant?: Pregnancy, early miscarriage, or abnormal uterine bleeding, which can be from a number of issues. Determine if you're pregnant first. If you're not, then just wait to see if it's a one time thing. If you persist in bleeding irregularly, see a doctor.

Prob your period: The brown discharge was likely your period just a very light one. Brown equals old blood. It is common to have an "off' cycle every now and then.