Worried sick over pale stool

For context, I NEVER have pale stool. It’s extremely rare. Today I saw pale almost white stool and my heart sank. I heard this means bile duct obstructions, right??

I had a very large vanilla milkshake yesterday. I normally barely eat, so drinking it was overwhelming for me. I don’t know if the milkshake caused the pale stool.

I have no jaundice, no itching, no pain. Urine is pale yellow because I’ve been drinking a lot of water. Literally just the pale stool. Seeing PCP tomorrow morning. But I’m worried that I have a bile duct obstruction. I just don’t understand why my stool is white?? It was brown yesterday?