Brown discharge before period??

Ashley

I have always been pretty regular for my period. Usually a day or 2 from what the app says. I have noticed in the past maybe 6 months a day or 2 before I start I get a brownish discharge that isn't even enough to wear a panty liner. Just notice it when I wipe. I am slightly concerned since it's something I've not noticed until more recently. Any ideas why this started?? I have not been sexually active in almost a year.