Breastfeeding.. barely any milk?

Okay, so I've seen multiple times people saying that not being able to get much through pumping does not mean you have an under supply. But... SERIOUSLY. I used to be able to get 3-4 ounces at a time after a few hours. It's been 4 hours, I pumped as I'm having company by the time he wakes up and will want to eat.. I got 1 ounce. There's no way my baby is getting enough every feed! I've noticed he's been a lot fussier or falls asleep at the boob lately as well. Is my supply drying up?