FTM.. am I overthinking?

My baby boy is 9 days old. I’ve been breastfeeding/pumping. I’ve been trying to breastfeed him every 3 hours. Oven been trying to pump one hour after I feed him. Up until about 2 days ago, when I pumped, I was able to get a decent amount of milk and would notice a nice stream coming out of both nipples. Now I notice no stream and I’m only getting about 2 oz total between both breast whereas before I could get 4 oz total. I’m upsetting myself because I’m thinking that somehow my milk supply is already deleting. Is this normal or to be expected ? I am seeing his pediatrician tomorrow and it will be a combined visit with a LC. I just need some peace of mind before then… if I’m Not pumping enough I’m afraid I’m not feeding my baby as well and it’s making me cry at times making me feel like I’m not good enough. Any advice is appreciated.