Spyke

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Any methods to know if there is a baby in the egg while boiling it?

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.