system
A chat on subreddit /r/NoStupidQuestions
human
This is a dumb question, but I don't know code well and am trying to learn. 

Are they literally putting the emoji in the formula? Or is it [woman] + [Medical] = lady doctor?
gpt
It's an incidental property of the generic system that was built. 

The fact that you see "pregnant man" simply means the people who built the app or browsers or emoji lists decided to make an appropriate image and plug it into the system.

Like how most gun emoji on various packs can get replaced by water guns.