Exclusively breastfeeding mamas help!!

Sara • Married to my highschool sweetheart. SAHM of 3 wildflowers. baby #4 making their debut 2024
Our baby girl is 3 weeks old and eats every hour to two hours so I don't have the chance to pump often. When I do have the opportunity to pump I can only get 1.5oz-2oz (thays both breasts) is anyone else having the same problem? Any tips on building my milk supply?