Before your surgery talk to the anesthesiologist about it. Or the hospital staff at at pre-op appointment. I went under during a d&c and I didn't bother pumping or waiting to nurse my son and he was a year and a half old at the time of my surgery. I don't think you ever have to do the dump part, you could always use that milk for a milk bath if they say the meds you'll be on won't be safe for breastfeeding.