haven't started my period yet. im 13 and have all the symptons like breast growth, pubic hair etc.

i had clear vaginal discharge for about 6 months. then one night, about 2 months ago, just the once i woke up with a little bit of brown discharge. since then i havent had anyhting, as in not even clear discharge. should i be worried?
how long do you think it will be until i start my period?