Vampires and counts

Went for my phlebotomy today.  I get my CBC and Ferritin checked before it. My white count was dwn to 1.6.  I knew that chemo does that I didn't think that after one week.  The nurse said that it sure can.  Tha t has me a little concerned.  I see my  Hematologist next week,  So we can discuss the wbc cout and my ferritin levels