Hi at your age the chances of it being anything serious are very low, in saying that it is a good idea to go to the doctors for a check on this. He may run some blood tests to see if your prolactin or other hormone tests are normal.
I would get a pregnancy test done at the Doctors at the same time. Good luck.
Best wishes
Angie
well, I do know a lady that had breast cancer and a drip in her breast was what made her go get checked---but as I have learned in nursing school in could also be an infection or you might be prenant