The answer will come in your bone marrow tests, not speculation. That's why he did them.
The BMB was done to answer those very questions. since you are symptom-free, there is little to go on except the biopsy to see if the marrow can tell any tales. probably will. there are many possibilities as to what is going on, but it's pointless to speculate until the results are in. Even the doc won't guess since there is so little to go on.
Just wait for that phone call….