Reborn Until the Day She Marries into the Lu Family

My sister and I married into the Lu family at the same time. My sister has been childless since her marriage, but I have been pregnant frequently. Give birth to heirs and excellent offspring for the royal family, and your status will rise. My sister was so jealous that she killed me while the royal family was out. When we opened our eyes again, we were back to the wedding day at the same time. The elder sister wanted to change her identity because her mother was more valuable than her son, and she forgot what her mother had told her. I threw myself into the arms of the eldest prince without any scruples, and confessed affectionately: "I have been in love with your highness for a long time, please let me do it." I said nothing and was sent to the third prince's palace in silence. In this life, it is her turn to be the fertility machine.