
Yes she was tested infertile at first they pretty depressed bcs they cant get a child so the empress decide the emperor should get a concubine so they can have an heir. And then bfr the emperor choose a concubine thet had a very long sex s righhhht bfr the emperor choose the concubine the empress was confirmed pregnant ヾ(❀╹◡╹)~

Im not sure if im right ( ̄∇ ̄") bcs i read thw spoiler longg ago so but if ypu want more detailed spoiler you can click the link ٩(๑❛ᴗ❛๑)۶ the side story spoiler basically explain everything about rizi pregnancy(≧∀≦)
https://forum.novelupdates.com/threads/lady-to-queen-webtoon.89902/page-
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I honestly didnt like the emperor bcs he's useless af. Buf i read the novel and find out miss gurl have trauma so i think i understand why he's like that. BUT I BEG UR PARDON SIR HE DIDN'T EXECUTED RED HAIR BITCH AND BEG THE FL TO BANISHED THE GIRL IN ANOTHER COUNTRY INSTEAD BRUH HE KILL UR WIFE WHOLE FAM IN PAST LIFE BRO AND HE COMMITTED SO MANY CRIME. Anyway the fl can get pregnant btw and they live happily ever after (๑•ㅂ•)و✧ .