Loosing my supply??

I’m worried I’m not making enough milk, my milk came in super strong the first week and a half, my let down was super heavy. He only nursed for a couple of minutes and was full. He gained 1.5 lbs in 9 days. So fast forward to now I’ve noticed my let down isn’t near as much at all but I’m definitely still producing milk as I drip and I can see it puddle in his mouth when my son lets off my breast. He now nurses constantly when he’s awake. We go back and forth between each boob about 6 times before he falls asleep. I have a haakaa and I can get about an ounce of milk from just let down when he’s nursing on the opposite side. I can hear him gulping but not for long. I feel like I’m loosing my supply. He’s going through plenty of wet and pop diapers as well.