My point was that something like this should have been built upon since way earlier, you bringing examples from the latest updates doesn't change that. They have never even had a conversation about it until now, which makes the idea seem even more like an afterthought or forgotten story-wise until now.
But that doesn't mean it can't be done. It just needs more time to develop a solid base for why she will get pregnant with Darrell's baby or anyone else's other than Ethans. Unless it will be an "accident". Maybe Ethan decides to do something sinister, or maybe it will be by Nat's decision. It will probably vary greatly depending on the path you play, which is why this feels "out of the blue" and lacking some groundwork, in my opinion. Especially since the sub-paths need to be written to work reasonably well together while having similar scenes and story direction. And I don't know if "a few updates away" is enough to convince me Nat is ready to get bred. Having it be an accident would make more sense, if you want it to happen sooner rather than later.
OR a funny scenario - If Nat isn't quite ready to go off the pills maybe Ethan swaps the pills cause he just can't wait to see Nat preggy. They start to have sex regularly again and he tells Nat they need to take a break from Darrell, Nat reluctantly agrees but sneaks off to fuck him anyway while thinking she is on the pill. And BAM suddenly Nat is pregnant, but by whom? Would be a good surprise.