Okay, so this first time might not have any fertile eggs, but you never know. Once the box and the incubator come in, you could try pairing them together again and see what happens. If they don't care about the eggs, I would just remove them since two are already destroyed anyway. You could let her sit on the other one, but that might encourage her to lay more. The only way you'd be able to tell if it's fertile is to wait about 5 days after they've been constantly sitting on the egg. If they won't sit on it, chances are it is infertile.