The technique you're looking for is called Candling. I used to do this when I made the flu vaccine.Its basically a light with a rubber cup on it to focus the light into the egg. Works really well.Here's a random website that seems to have good info:https://www.thehappychickencoop.com/the-complete-beginners-guide-to-egg-candling/Candling will not tell you if the egg is fertilized until Day 4 or so, when the veins start to develop.
Deport him to Russia