to boost milk supply

To start making milk do I have to pump every 2 hours or can I just pump various times throughout the day ? cause I think I'm stressing more about pumping 2 hours cause it's taking a toll on me and that's why I'm barely producing anything. My SO told me to just let nature take its course and pump whenever I'm rested Vs pumping every 2 hours and running on no sleep.. is this true or do I have to pump every 2 hours no matter what.. I only make like a few drops or half an ounce unless I wait a while to pump then an ounce will come out of each (My 3 week old is a great latcher, the thing is when I put her on the boob and she latches she seems frustrated.. as if nothing is coming out. I'm sure some drops are coming out but i guess that's not enough for her)