Hi! So, I had this in my 20's. I wasn't pregnant. Your first thing to do, IF you are sexually active having intercourse, is to take a quick pregnancy test. If you aren't having intercourse or take a test and it is negative, then it's on to further investigation. For me, I had a hormone imbalance and thyroid issue. This a common cause. Hyperprolactemia is the technical name for it. They did give me an MRI to rule out a common, harmless benign tumor of the pituitary gland that also is a cause of nipple discharge. I'm assuming this is the nipple like lactation and not the piercing? I think they would rule out infection also. Does the discharge have an odor, do you have pain or is it hot to the touch? Those are infection signs. But otherwise, you may have the hormone issue I did (I had too much natural estrogen protection). It's a pretty common problem, usually not serious but something you want to talk to your doctor about. Your mom won't be mad I wouldn't think. Does she know about your piercings?