It's not milk yet. It's called colostrum, it's pre milk. But yeah it's normal. This is my second pregnancy and I've been leaking since like 16w, and it's getting worse now that I'm at 30w.
And this really doesn't mean anything, at least I don't know if it does cause I'm not a doctor, but with my first I never leaked during the pregnancy and after baby was born I couldn't produce enough milk to nurse. So, personally, I'm taking it as a good sign. But who knows.
Oh, if it's bad, or gets worse, you could start sleeping in a tank with a shelf bra built in and wear breast pads. Johnson's and Johnson's makes the best disposables.
Mine started at 20 weeks only at night but it progressively changed to any part of the day now 34weeks So it's totally normal