How can I tell if my milk supply is dropping?

kayla • Wife💍 Mommy to an angel and a rainbow baby ❤️ Step mom to two. 💙

My baby will be 8 weeks on Tuesday. He’s been exclusively breastfed and we haven’t had to supplement with formula. But lately he’s been eating more frequently. He was eating every two hours but now within an hour he’s screaming and won’t stop until I feed him again. I’m worried I may be losing my milk supply. How can I tell?