Should I Pump Out The Breastmilk

Hi mummies, my baby girl prefer direct latch more than bottle feed. But her drinking time is irregular. Sometimes per feed can last for 3-4hrs. Sometimes only can last for 1-2hrs. In this situation should I empty the breast after feed? I'm kind of worry if I pump out and she don't have milk to drink. And I felt my milk is getting lesser. She is 2 months 5 days old.