Also, the little blood spots in eggs are not from being fertilized--that's a different issue with the hen. You will never know the difference between fertile and unfertilized eggs unless you know the specific thing to look for (a slight difference in a small white spot).
I personally process most cockerels--they harass the pullets/hens, they ruin the feathers on pullets/hens (especially if you only have a few), and they're noisy. I have one Chantecler rooster right now that I like enough to keep around--however, they rarely make it to 16-weeks around me.