Nipples leaking? (TMI)

About a week ago I noticed a small round stain inside my bra right where my nipple would be and kinda wondered if I had been leaking but decided it must have just been sweat cause I was working outside that day... Today I noticed some white residue under my nipple kinda like what you might get under your eye after crying when the liquid has evaporated or dried. Tmi warning but I decided to try squeezing my breast a bit and a mostly clear but kinda cloudy liquid came out! I'm 25 weeks pregnant today and wasn't expecting this so soon! When did you first notice liquid leaking from your nipples? I'm not worried but wondering if it's common at this stage. Thank you!