What is this yellow stuff in my breast milk?

I was cleaning my breast and i squeezed it and dark yellow puss looking liquid came out along with my breast milk.....im 7months pregnant and my breast milk is not fully white its more of a foggy white but anyway almost everytime i clean it that yellow stuff comes out its the color of the yellow in a egg and sometime a white looking puss comes out in the other breast more white than my own breast milk I DONT WANT TO BREAST FEED IF THAT KEEPS COMING OUT, WHAT IS IT ?