Elevated WBC 13.2, after Cortizone injection

Hello,

I had a Cortizone injection in my right Hip on 08/28/17, then I had my reg. physical on 08/30/17 during which I had a blood draw.  The results of the bood draw show my WBC at 13.2 - is this a result of

the Cortizone injection two days earlier?   As my sister was just diagnosed with acute Lukemia I am a bit concernerd.

Thank you