Electric pump breastfeeding

Sino po sanyo nag pa pump? Ilan po ang na papump nyo sa isang upuan? For example 1 pump for 20mins nakaka ilang ml or oz po kayo? Im 3weeks mom plng po pero ang na pa pump ko kada 20mins both breast is 1oz... im taking natalac 2x a day, life oil 1x a day, but still konti lng ang napa pump... pls help monshies!