Might need a couple more weeks to know if they are fertile. They will begin to "chalk" on the outside and when you candle them you'll notice small red veins.
So I don't think the first clutch of eggs are fertile. They seem to have nothing forming inside them. Although, my tortoise layed a second clutch exactly one month later and they seem to be progressing differently. Would anyone be able to tell me if these look to be possibly fertile? These are at 14 days