Increasing milk supply

Just wondering what you mommas have used to increase your milk supply. I saw a lactation consultant last week Monday and she told me to pump every 2 hrs for 15-20 mins and my supply should increase. But so far nothing. There were a few times I was able to get 1 oz from one boob but now I can barely get 2 mL. So if you've used something that helps, please let me know!