Nipple discharge question...TMI

So i have a 9 month old. I had a double mastectomy 3 years ago so I couldn’t produce milk to breastfeed. Been having issues with discomfort in my right breast and was in the shower and saw white dots on my nipple. I squeezed my nipple and a thick white discharge came out. Kind of freaked me out. Going to the dr on Tuesday. Idk if this is normal or not?