Clear discharge from nipples?

Brittany • Baby Mason is due on February 7th, 2017 ❤️ baby #1

I'm on 100mg of progesterone, and when I was taking out my nipple piercings, I noticed that when I squeezed my nipple, clear liquid came out... it wasn't a lot, but it still freaked me out...

Has anyone ever had that reaction to progesterone? Please respond, because I'm not sure if I should stop taking it, or go to the doctor (who is difficult to get in to be seen without an appointment)