Pump Session

I'm using an electric pump but no idea for how long should I pump for a session? But I know I should pump every 3-4 hours. I'm also using the Haakaa pump for my letdown. Is it normal to get low supply? I only can get 30ml for the left and my lazy right breast can only yield 10ml 😞 I eat oats biscuits, Milo, Longan Red Dates drink and a lot of fluids. Can't take Fenugreek cos it made me have painful gastric. Also, is it better to just put my bm in the fridge or freeze it? Using it daily though. My 19 days old baby latches and also drink from milk bottle. #advicepls #pleasehelp