Yes, but, there's something fishy with that test: Duke Ergi, who was the one who made the test twice, never showed that he used the right baby's blood to do the paternity test, in fact Sovieshu realizes that after he made the baby escape the palace (He wasn't able to kill her, so he made disposition to send her away somewhere he will never know about to let her love her life freely) and tries to find the baby to retake the test but it's too late.
Ergi maybe planned everything to destroy the emperor's reputation.. So I came to ask myself: what if?
Yes, I know about the poison and everything, I read the novel, but it's all left to your opinion in the end:
Can we really be sure Navier was infertile?
And if she was and was cured with the magic bed, can we really be sure Sovieshu was too and the baby was his or wasn't?
It was a comment about this speculation
idk, it still doesn't really convince me, i believe that the poison consumption through the cookies both him and Navier ate is something that made him definitely infertile because that's what it did to Navier too, since without the magic bed, she would never be able to give birth to the twins. Ergi could have falsified it simply out of fear since he had no knowledge over Sovietsu's infertility, so in my opinion this isn't really a hint although i understand what you mean.
i've always been curious about Soviet really being infertile b/c the duke (Heinly's friend) told him Rastha's baby was really his (after the whole DNA test, Rashta being punished, child sent away). & honestly Rashta till the end really did believe it was his. Like in her downfall when the Emperor is getting rid of her she's like imma bring you down with me (or something along those lines, so she's yelling insulting things to him in court, where there's nobles present). My thing was if she was really trynna hurt the emperor she would have said something like "you know what, yeah that baby was never yours!!! I lied & used you this entire time!!!!", you know to like hurt his pride but she didn't. & the novel didn't clarify, so your left with that what IF... (well at least to that ch, havent caught up with it but i was up to when he looses his memory) any who, i'm like did the duke just say that to torture the emperor since he had already sent the child away thinking it wasn't his or is the kid really not his ( i mean its most likely its not his since the baby looks identical to her other baby, but even her first baby didn't look anything like baby daddy #1. so both baby's look like the mother & nothing like the baby daddies) so who knows
& the novel till the point didn't clarify either. as a reader we just assumed Soviet was infertile since Navier was able to get pregnant & we were told Rastha's baby was his. But your theory can possibly be true. Like honestly they both could have been infertile since they both ate the cookies when they were kids or maybe it was just Navier who was enferitile & the magical bed helped. Like i said until that point in the novel, it wasn't clearly stated so your left to interpret how things appear, but who knows

SPOILER DISCUSSION
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Everyone who knows that Navier will have a child says that Sovieshu is the one unfertile and Rashta's child is not his
BUT I have a theory I'd like to discuss:
What if Navier was really unfertile and Rashta's baby was Sovieshu's?
Navier, after marrying Heinley, sleeps every night in a special bed, made of magical stones -or something like that- that helps people being healthier and heal faster... What if she had a problem with conceiving children before that was cured thanks to that bed?