Hi cadence,
I had the same problem and went to my doctor and specialist about this. I would get it check out by your doctor but thought I would post this from a medical site on breasts in hopes to help you a bit.
The glands and ducts of the breasts secrete fluid all of the time even though they are not lactating. The amount is so small it is not noticeable on a daily basis but if a duct plugs up with normally sloughed skin cells, the fluid builds up and a cyst is formed.
not really much but to say it is normal and more commonly
found (40 - 50% more) in premenopausal women.