I truly believe that we should be taught that pregnancy goes beyond childbirth. The body changes SO much --- physically, emotionally and mentally. I have to remind myself that what I am going through as a new mom is natural many times. It is most important to give myself the courtesy of listening to my inner voice and taking care when I am feeling out of sorts, especially when I just want to be in the fetal position with a box of cookies watching reruns of Will and Grace....
I found this that might be of interest...not to scare but to inform:
"A discharge from your breast(s) could mean that your breast(s) are infected, that a breast duct is dilated, or that you have a hormone imbalance. The discharge may be on just one side or from both breasts. When a milky discharge comes from a woman's breast when she is not breast feeding, it's called galactorrhea.
This condition can result from taking certain medications such as birth control pills or anti-depressants, from being pregnant or recently being pregnant, low thyroid levels, or rarely from a small benign (not cancerous) pituitary tumor. Your body may be making extra amounts of prolactin, which can cause this white discharge from your nipples. A brown or bloody discharge may come from dilated breast duct or small polyps in the breast ducts."
I think the best thing to do would be to visit your health care provider, you will feel better for knowing, especially if it is just a stage in your pregnancy.