Is my baby starving or cluster feeding??

Hi ladies, I'm a FTM and exclusively breastfeeding my 3 week old son. I used to pump often but not anymore, I just use a haaka when I breastfeed. Lately my son has been eating very often and will only feed 10-15 minutes and then not even less than an hour later, he's hungry again. And I feed him and he gets hungry AGAIN. Since I'm not pumping, idk if I'm making enough milk or if he's simply cluster feeding. How do I know I'm not unintentionally starving my baby??? 😭