
Is the empress infertile?

no.
one of the reasons soveishu divorced navier was because he thought she was infertile (when they were younger, soveishu stole a gift cookies from his mother that was supposed to be given to the concubines (to prevent them from giving birth.) he ate the cookie, but apparently navier ate more than him and so he thought that navier was infertile and not him.
navier goes to the western empire and gets pregnant. Soveishu then founds out that he was indeed the one that’s infertile and he wasn’t the one that knocked out rashta so the baby isn’t his
the title is also the same