Am I making enough milk

al

I didn’t breast feed with my first due to her refusing my breast milk in a bottle and refusing my boob now second child he has a bad tongue tie and lip tie but loves the boobies lol. So I decided to exclusively pump I get about 3-4 ounces every 3 hours mostly 3 ounces every 3 hours. I want to increase my supply so I’ve been pumping for 30 minutes every 3 hours around the clock. I don’t know if I’m making enough milk