But you can cum in Zahra IIRC, so it's not logical if she's still fertile.
I think you are victim of the "chekovs gun" effect, meaning that in this case, if you can cum in her, there must be a consequence.
which is true and valid, for you, since you like pregnant content and pregnant sex I assume.
I don't find these two very appealing, but I like to creampie without consecuence, somebody else maybe like to paint her and don't share our kinks.
Now we put the Skin of the dev on, how does he satisfy all 3 groups?, he makes it optional, and in that case he has the Window open to add Pregnacy content later on.
the tricky thing is that in all 3 groups allways will exist nuances, (I admit that for the group of pregnacy sex all VNs KN s have little to no content, meaning that happens often in the epilogue or at the end of the game)
a few VN's / KN's have a 3rd option (crempie with pregnacy) when they have a path for pregnant sex.
All what I said is, if she is fertile, or not, or if she doesn't want to have children anymore, that is open and up to speculation,
don't for get that since ancient times there were effective contacepion methods.