Thank you for your query.
There are many causes of increase WBC
The common causes are infection,inflammation,trauma,surgery,hematological abnormality & some stressful condition.
But you need not concern about your high level.
It is only mildly elevated from the normal level.
If it is not correlated with clinical features then it has no significance
The painful condition from endometriosis
may cause occasional elevated level of wbc & neutrophil.
So do not worry.