You want me to add a new function to every single potential pregnancy event in the game. Yes, that would be a lot of work. If you or someone else wants to make a mod for it, feel free.
There are absolutely pregnancy clips in the game, but you have to make certain decisions to access them (using a brown light to speed up specific characters). It only applies to specific characters because, again, accounting for alternate pregnancy clips and images and text every time you encounter a character is a lot of work.
If you want to only get some characters pregnant and not others, there's already a method in-game to accomplish that. If you want something more ultra-specific to your tastes, Mrach_31 already wrote an outline on how to accomplish whatever pregnancy chance you want:
It will be today, but it will be later today. I still need to finish one last scene with a certain secretary and then give it a little time for patrons to bug hunt before I put it up here. Because I'm still working on it, I can't give you a definitive time (I don't just sit on releases before making them public), but I don't imagine it will take an insanely long time to complete either. So a little more patience and then you'll be able to make it all the way to the end of 'Saturday' content.