that's only a half-truth, we will probably see the girls REALIZE and ANNOUNCE they're pregnant in the coming updates, but ony see actual bellies and kids in the epilogue.
You have a point certainly, and I hope I'm wrong (more pregnancy content would only make me happier, whether its bellies in various stages of swelling during sex scenes, or simply just some coital and post coital discussion like in OiaL), but consider this;
In just the last chapter, there was a time skip of a whole month. And while I don't think that will be the last one. I expect there will be a few more time skips and time progression in the game (we've covered a few months total of in universe time so far). Caribdis
could simply say no one is showing, or ignore it, or he could simply not have anyone get pregnant or comment on it until nearly the end chapters. I'd love to be wrong, but that's my read on the situation.