I can only speak from what I played so far and how it feels to me. I really only was commenting because I find the pregnancy thing makes sense from a story point of view with certain characters to me since that what was being talked about.
But for how I feel on the subject from what played so far ( just got back from the west so things can change)
i'm 50/50 on Cass cause I really like how her path plays and feels but yeah she doesn't feel like a LI that it would make too much sense either for her character to get knocked up. But I can also kind of see it happening ( depending on how her character is by time I finish my 12 or so saves) cause just like Elin I get a sense of closeness with her just not as close as the twin for obvious reasons.
The mother just doesn't feel right to me cause how that relationship mostly feels creepy to me with how the MC acts towards her if you are on her path. It's also why to me if im being honest that is one of the few incest relationships I could do without in this game. Since this feels more like a story first game than a incest game to me otherwise be whatever to me. This is coming from someone that mostly only likes mothers from incest games too.
I also kind of feel the same for Ophelia as I do with the mother just with less of a creep factor. But also kind of mixed about her too cause she is a really fun character yet and she has made it clear what she wants and how she feels. Yet the way she acts gives me pause , which is why she is on my content saves and not my main saves same goes with the mother. Also I kind of don't like the mother very much compared to Cass , Elin and Ophelia and Aurora. Only 1 I dislike more than the mother for now is Isis
Now im only looking at it from a story telling and love path point of view cause that is how I see this game. Not saying they shouldn't be there at all or anything cause I get why it's there especially since you can play your MC as an asshole / creep where that playstyle in my eyes the mother makes sense to me for those type of saves or MC's. But that is why there are certain incest relationships in this game I could do without on a personal level which is why I don't play them on my main saves only content saves