brown liquid

I have this brown liquid coming out of my vagina, it's not thick like a period it is a very thin liquid. My period isn't due for 5 days and Id it is ever off of schedule it is late, never early. I usually get cramps with my period so I don't think it's my period. I checked down there and nothing looks off, also I looked for hemroids and there are none. I am 15 and I am a virgin, however I do masterbate but I have not one anything internally in a couple months. Does anyone have any idea what this could be thank you.