itch.io

Yes, If you join their discord, there are channels for save file editing and coding and modding that have pinned guides on all kinds of edits you can do. I can't remember which channel has it, but I know I've seen a guide or a pinned post for pregnancy edits.

No problem. :)  One other thing I just thought about, if you decide to completely delete a cat from your save you need to remove its ID number from the clan's notepad file too so it doesn't mess anything up.

Technically, you can do that without a mod.   You just have to edit the spreadsheet file for your clan to change or add cats. if you join the discord, there’s an older guide in the pins that tells you which columns do what. It isn’t up-to-date but it’s current enough to help get you started.