if humans could lay eggs, would it be illegal for people to leave egg at home while they go to work or they go out for shopping ?

It depends. When we had a farm, we had a few ducks, and were surprised when the female laid eggs and just left them in the nest. It was still pretty cold (in the 40s) and she wasn't incubating them at all. However, when she'd laid the clutch, she started incubating them, and the logic was obvious when they all hatched at the same time. If she'd incubated them from the start, they would have hatched a day apart, which would have made it difficult for her to both incubate the ones still in the nest and feed the chicks that were hatched and running around. If you've ever seen ducks, it's just like in the movies where the mama duck is in front and the chicks are in a line behind her. That only works if the chicks all hatch at the same time.

So if human eggs worked the same way, it wouldn't be a problem to leave them at home. Most people would have artificial incubators anyway.

Nope! Now just imagine some woman laying a dozen eggs! 😱

You do know they as well need to be inseminated! 😈