What Causes Greenish Blue Milk From Breast?

'Good morning! My name is Amanda Gonzalez. I have a medical question. Right now, I am unsure if I am pregnant or not, yet, I keep discharging milk from my left nipple. This morning is when I noticed that I was discharging greenish blue milk from my left nipple. Can there be something seriously wrong with me? Does this cause for serious medical attention?