None of the three main "bulls" in the game require pregnancy as part of their events, regardless of any "get pregnant" type commentary. You just need to progress their events to level 12 (the pixel animation one), and that's it, you're done. Also, I'm pretty sure that Monica needs to NOT be pregnant by the end of the final day if you want to get their ending, but I'm not 100% sure on that.
In any case, their events needing Monica to NOT be pregnant was the same aaaaaaall the way back in the original first version of the game in JP, so this is not something Kagura did or anything like that. It's just how Acerola designed things. All of the main bull endings end with Monica getting fucked stupid, Kyle finding her while getting fucked by the guy in question, Kyle fucking off into the the sunset (and probably hiding under a window or something to fap) then a bit of a time skip to Monica now pregnant and getting fucked retarded even more.
As is, most other "storylines" don't have 12 scenes + an ending, so I don't think there's anything to complain about.