What Causes Water Like Fluid From My Vagina?

I have a water like fluid leaking from my vagina and I can't stop it. I don't even know it's happening until it's coming out. Sometimes it's only a little and sometimes it soaks my underwear. It has an odor to it and sometimes on toilet paper it looks very light brown but I don't have my period, nor am I supposed to get it for another 2 or 3 weeks. Please help!