Lactating at 25 weeks?

I am 25 weeks pregnant and am beginning to have slight leakage from my . While the leakage is not bad, only slightly and not posing a problem yet, I am just wondering what I should be on the look out for? I have been very sure to keep them clean to prevent any kind of irritation, but am looking for others advice. Also, the color is not "milk-like", almost like a thick water. Any advice helpful. Thanks!