barely pumping anythint?!

so my baby is EBF but i do have a manual pump, and my baby has some dry skin right now, so i’ve been putting breast milk on it every night which has helped a ton! but tonight he ate, and then i grabbed my pump to get an ounce or two to rub him down before his coconut oil, i barely got anything?! i’m super worried my supply is decreasing. he’s very chunky and hasn’t lost any weight, but i’ve never pumped and not got a ridiculous amount.. is this normal? has anyone experienced this and it been just their body regulating to his needs or is my milk decreasing?! he’s 2 months old now.