pregnancy boobs

OMG! Ok! So I'm 17 weeks and 4 days. Everything is all new to me. I'm laying on my bed watching a movie and all of a sudden I feel something wet on my chest. I look down and it's from my boob? My boob is leaking clear liquid? Part of it is dried up which is a clear milky substance? 
Now I know you can leak milk but I thought I would have to wait until I'm way past 20 weeks for that to start???? 
Is it "normal?"