Daphnis nerii eggs

Hello everyone,
A Quick question: is there a way to understand whether Daphnis nerii eggs are fertile or not? I have a female that laid down a good number of eggs on an oleander branch inside the cage but I'm not quite sure She mated with the male with her.
Thanks for your feedback.

And in fact, they were all good! I have plenty of hatchlings born this very morning going round the breeding box!