Have you been consistently pumping 30ml? How long has it been? If you only been pumping for a few days, and now can't pump anything, then you prolly need to do a lot of power pumping for your supply to come back. Look for food to boost your supply, maybe like fenugreek supplement or something..
If you have been pumping for 2 months or so, and consistently 30ml, and stopped for a few days (not like weeks), then there's no need to worry, just drink plenty of water, continue pumping and nursing as usual and your supply should come back within a few days as your body should already be producing milk on supply and demand.
Anonymous