White liquid coming out of my breast ?

Ok ladies..so my SO and I had a child two years ago so I know my milk has dried up..we are currently Ttc. Today while getting dressed i noticed that I had some white liquid coming out of my right breast. Its alittle drop. When I squeezed my breast..a little more came out . Im not sure what this means or what to do. Has of right now, the liquid is there coming out. But not major. Has anyone had or has this problem? What does it mean? And what should I do?