"in a fantasy game"
Melty's Quest had pregnancy stuff, so it's pretty obvious, why people are expecting this fetish to be in Karryn's Prison.
Like I mentioned before, we've got a crazy scientist in prison, who turned people into slimes. How hard is it to imagine, that he can also make a drug, that makes pregnancy progress faster? Do you really need anything else, when there is a perfect opportunity like that existing already in the story?
Anyway, it's really up to developers at this point and you can only keep hoping.
It is not about, what is possible. They can do everything they want to. But when people say it would be more believable, if she got pregnant and carry out the Child in 3 days, that is just a stupid argument to make. How about, Karryn got protection from a Magic Spell and everytime she would get pregnant, the guy instead gets pregnant. Makes the Story now more believable right, since I explained it. Same for, it would make the game better. That is such a biased statement, since those people have a fetish for it. People that hate it, I am pretty sure wouldn't like it.
The big issue for me is, that is shown here over and over again, people want Pregnancy to be in the game for the Sake of pregnancy content. They don't actually care at all, if there are any gameplay effects with it. How does she get pregnant? Well, just have a basic system that has a chance on creampie to get her pregnant. Really? Anybody thinks for a second in this specific game, if they would do pregnancy, that they would not do a deep system, with all kinds of Modifiers and that Karryn has Cycles, that it matters if Orc, Goblin or whatever impregnates her and much more? Or while she is pregnant, I have seen people say, well if it is to hard to balance, just don't let it effect gameplay. So once again, it is just there for the sake of being there. Or the Child just gets taken, that it doesn't effect future gameplay. So what is then the point of it being there, if it doesn't really effect anything? Because pregnancy content. Great.
And that what is to me the most annoying thing. People wanting a fetish they like to be in the game, so just that it is in the game. Gameplay effects? Who cares.
Also I am pretty sure, they want to release this game on Steam. And a pregnant women fighting, could be a big red flag.