After Giving Birth to the Ancient Dragon, the Sterile Dragon Prince Broke His Guard

In my previous life, I was unable to conceive when I was married to the Dragon Prince, but my sister gave birth to a golden dragon egg when she was married to the Second Prince. In anger, the prince found someone to insult me ​​and then cut me open. "If you hadn't been able to give birth, how could I have been deprived of the throne by the emperor's younger brother!" He hugged his sister's waist and smiled as he watched me die. "Fortunately, the dragon son Yue'er gave birth to is mine, and I am the king of the dragon clan!" After I died, they cooked my phoenix body and tricked my father into eating it. After knowing the truth, he was heartbroken and guilty and vomited blood and died. After his rebirth, he chose his sister to be his princess. I would like to see how the infertile Dragon Prince can give birth to a dragon baby.