It is 7 days before my period and when i go to the bathroom my panty liner has very very light and odorless cm that's white and brown in color, why?

It depends: Vaginal discharge will change throughout the menstrual cycle and can be a normal sign of hormonal changes On the other hand, vaginal discharge can indicate infection. Odor can be a sign of bacterial vaginosis. Vaginal itching can be a sign of a yeast infection. Sometimes vaginal discharge can be a sign of a sexual transmitted infection. It is a good idea to get checked out if you are concerned