True. Maybe not everyone knew but I do know that they have had goverment records of intersex people since the 1300s in China so considering we is the crown prince there is the likelyhood that he already knew about this. Having said that those records were very vague and rather than specifically distinguishing them as intersex, it was listed that their sex would alternate between male and female so idk.
Then there's also the fourth possibility of they're a demin so they're neither male nk female in human form option? Pretty far fetched though considering we have ghosts in this story it doesn't seem rhat ridiculuous when you also have magical cure plants so I'm assuming that some form of cultiviation exists in this world
http://www.mangago.zone/read-manga/your_highness_i_m_pregnant/uu/nml_chapter-41/pg-1/
Does it not click that she is a girl for her to be pregnant or is this a omega verse and no one told me. Make it make sense