-confused-
Yes, it's discharge. And as long as it doesn't smell bad, it's normal discharge. This is typically a sign that your body is getting ready to start having periods, though once you DO start having periods the discharge will not stop. It's there for life.
As you get older, you'll see that the discharge has patterns - looking slighty different when you are ovulating (able to get pregnant) than right before your period.
I can't say when your period will come. For some people, that's quite a while after they start having discharge, but others get their periods soon after. It's a good idea to start carrying a pad around with you.