In march my white blood cells were 17. in april it went to 13.4 and end of april it went down to 11.3. i figured what ever it was going on that it was getting better. now in august it is at 11.7. what does that mean, should i be concerned?

Do you have WBC numbers in the previous years? If not, the percentages of each white cell types (differential) may give us more info to help you. 17K is a little bit high for idiopathic leukocytosis but people with high white cell count of 11-14K are not uncommon and I have followed at least 5 patients with that condition. Because the last 3 numbers are fluctuating around 12 +/- 1K, you are OK.