@gladiatorua i called bullshit on the unneeded drama part not that it would be illogical, since WE ALL want her to be empress and empress is seldom a women that is infertile not because emperor are dicks...most of them....some....but because their vassals demand a continuity of the bloodline and the ones with the emperors children and having backing become empresses normally.
Now having fertility issues are as likely as not having them, and nobody would even have though about that unless the author put this possibility in front of us,creating unneeded drama.
If she needs to prove her superiority to the other vassals and show she is fit to be a empress or needs to move away form the empress position or even part with the emperor since they see her as a unnecessary distraction. and then that is fine and ok drama in my opinion but just saying maybe everything is nill and void and we may get a bad/sad ending, just to make the readers panic is a dick move.