One of my female russian tortoises has laid two eggs. The first one was one week ago and the second was about 4 days ago. I'm trying to candle the eggs, but despite all of my research, I'm having a diffcult time determining if the eggs are fertile or infertile. One of the eggs looks bascially yellow on one side, the other side somewhat clear. The other egg is pretty much yellow throughout. They both appear to be chalking. I didn't clean the eggs before putting them in the incubator, so they are pretty dirty, which is making this even more difficult. Looking for advice, pics, etc. that will help me through this process.