White milky discharge comes from breast when i squeeze it.can i be pregnant?

Maybe: Discharge from breast can be due to pregnancy, but it can also be due to a tumor in the brain. Your next step would be to take a pregnancy test. Assuming that is negative, after that, i would make an appointment with your doctor to get some blood work done. It's likely benign, but you want to make sure that there isn't something serious going on.