Corys keep laying infertile eggs

I didn't think about the nerites laying eggs. I have 2 nerites but I don't know their sexes (or how to tell). I assumed they were infertile cory eggs because after some light research, I thought cory eggs became slightly transparent and you could see a dark spot corresponding to the fry in the eggs a few days after being laid. Some of these eggs have been in the tank for weeks--they are everywhere, on the glass, driftwood, plants, and filter intake. It doesn't seem like they are getting eaten and I'm not touching or moving them.