Vaginal discharge before a period is a normal occurrence. The discharge performs a significant protective function for the reproductive system of the female. It helps to get rid of the dead cells and bacteria, therefore preventing infections.
its not bad,everybodys bodies work differently,your body just progresses slower.you should start the discharge soon although im not sure your age if you are 11 and under its normal if you are 11 and older you should start having it soon, if you are 13 and older then there might be something to worry about and you should talk to a doctor but like i said everyone progresses differently. :)