No you should not be worried.
Your WBC is in the normal range, and even if it were a little low, as an isolated finding it is not significant in almost all cases.
A slightly low RBC count, if the hemoglobin is normal, is also essentially a lab anomally and is not significant.
Simply have a CBC repeated at your next doctors visit. That should be all that is needed based on your information.
Check this with your primary care doctor who I believe will tell you the same. We do not replace your doctors visit or advise.
Let me know if you have further questions.
Also, please click a positive rating on the rating scale. In fact, a 5 rating squares me with just answer and allows me to provide prompt and accurate service to you, but does not increase your cost. And, I will be here for any follow up needed.