HELP!

I am 18 years old. I am coming off of my period (will start the next month of pills tonight) and today I noticed discharge from both of my nipples. When I apply pressure to certain parts of my breasts, more discharge comes out. It is not bloody. This has happened a few times before- once there was a noticeable stain on a tshirt around one of my nipples and a few mornings ago, after sleeping on my stomach, there was a wet spot where my boob was on the mattress. Is this normal? Should I be concerned? I first thought that it could be a sign of pregnancy but I got my period this month? Help!