Probably not like you think it will. Or in any SUPER awesome way that people into that would want.
You can sleep with, or watch the pregnant woman sleep with others.
There is a bit more but I can't say without blatantly ruining the story.
However, I will say Annika can not go full cycle IF she does get pregnant. The game only lasts two months.
those two months can be repeated with a special New Game Plus system I have, which ties into the story.
Depending on how well the game does, there's a chance that I'll continue working on it after I finish it. Give it an expansion of sorts. It really just depends on how the players feel about it. If they're dying for more content. I'll very likely create more for them. In which case pregnancy would get a massive update.
If the game doesn't do too well, I'll finish it out and start my next one.
Probably not the answer you wanted but, it's the best answer I can give you. lol.