It doesn't do anything yet. The long term plans for how pregnancy is going to work hasn't been nailed down yet.
Hmmm... I hope that it's not just a "ending" thing like so many VN style games. ie. show a tacked on epilogue with a belly, include the tag and call it a day.
My personal preference is that it becomes a gameplay thing and girls can give birth and repeat the cycle as part of the daily sandbox of the game (obviously with a massively shortened cycle - not 9 mths! - this isn't real life thank god - lol).
I get that this is less ideal for a developer as it introduces so much complexity... But I also think it's one of the mechanics that has made a game like Summertime Saga so successful.
I think story-wise, it would be fun if some characters desperately want the MC to knock them up while others you have to convince or trick them to stop taking contraception.
I guess the other issue is what happens with the hypothetical children. I'd argue that the fetish is breeding, and not Child Rearing Simulator 2022. Maybe Diaz and the Feds can take them away from the unsafe Mafia home to a government super soldier facility lol - the MC needs to pay off debt right? - government buys the kids. LOL.
Either way, I've supported on Patreon. The writing in this game is funny and super self-aware and I'm confident it'll work out whatever direction WillTylor takes things.