Talk to Gynecologist on PCOS

my wife is pcos patient, having one daughter with iui. we are the patient of dr.arshad chohan. Now we are trying for 2nd baby iui with gender selection.3 cycle with no success. pls guide me how many cycles can be perform with iui. as lot of medicin an injection are used. is this harmful?.and what are succes rate with gender selection iui per cylce.