Having a low white blood cell count can be caused by something more serious but sometimes a low white blood cell count may only be caused by a temporary viral infection that would clear up on it's own or with treatment.
Some disorders that occur at time of birth can also lead to a low white blood cell count so it may or may not be a bad thing that your white blood cell count is low.
But you should always speak with a doctor about the low white blood cell count to determine the exact cause and get treated for it if needed.