Ah mama, yan talaga ang struggle ng marami sa amin! Kailangan mo ng frequent pumping throughout the day kasi supply follows demand, the more you empty, the more your body makes, so try pumping every 2-3 hours if you can, at least for a few weeks to build it up. A few of my mum friends swears by drinking tons of water, eating oatmeal, and making sure they're resting well because stress really tanks supply. Also, if your pump isn't getting milk out efficiently, sometimes it's the flange size that's wrong, so check mo yan or try pumping right after baby feeds kapag breasts mo are still full. Pero if it's still not increasing after a couple of weeks, best talk to your OB or lactation consultant para ma-check kung may underlying issue, kasi sometimes may medical reason din talaga.