Not enough milk

Pumped for 15 mins yan lang nakuha, ibig sabihin ba ganyan kang nukukuha ng baby ko sakin? ? Or pwedeng di lang ako marunong magpump / di maganda pump na gamit ko (manual)? Usually direct latch si baby sakin and ok naman wiwi at pupu nya. Will get back to work soon. Paano na? ?????