wbc COUNTS DOWN

[Alice]

I just went in for my 3 month follow up today. Most things went well. I'm on 3 week herceptin and have 5 months left. I have been off chemo since Sept 05 my surgery was on 10/05 and I had rads thru 1/23/06. My wbc count at the time of surgery was 2.9 and now is down to 1.9. Has anyone had this happen ? If so what could it be ? I should get the rest of my blood results tomorrow.
Thanks, Alice