CBC question for docs and nurses

I have kind of a weird question. I am an endurance athlete training for a marathon. I had blood work done recently for fatigue and appetite loss and my WBC came back low. Here's the stats that were low:

WBC: 3.6

MPV: 7.2

Neutrophil: 43.4%

Neutro absolute: 1.55

eFGR: 86

My doc has ordered some more blood work for autoimmune disorders. My question is this - is there a chance my high mileage running is lowering my WBC? Hoping that's all it is. Currently I'm waiting for my autoimmune results and I'm very anxious.