I'm not sure about iguanas at all cuz I have never kept one. But I believe they do lay eggs fertile or not. I am unsure whether or not they are fertile. The two have been kept together for about 2 months and it takes between 3 and 4 weeks from mating for the female to lay the eggs. So they have been together long enough.
I have not candles them, I do not know how. I will take any tips though! (This is my first time actually breeding a reptile)