What does it mean for a girl to have brown discharge before her period?
Brown discharge is known as spotting, it's caused when there is
light bleeding which mixes with discharge and because the bleeding
is so light it takes time to leave the vagina so thus becomes brown
in colour. This can be a sign you're starting your period, but it
can also happen due to hormonal imbalance while your body readies
itself to start ovulating (and in turn start menstruating).