She met the male protagonist in search of the Cat's Eye Stone. Was the female protagonist a secret agent?

The female protagonist was a special agent who was tasked with a cat's eye stone. In the end, she brought her physical body to meet the male protagonist because of the cat's eye stone. The cat's eye stone that she lost her life because of the mission was with the male protagonist. In order to get the cat's eye stone back, she stayed by the male protagonist's side. The male protagonist was cursed by his family. The female protagonist wanted to mess with the male protagonist but accidentally helped him to lift the curse. The female protagonist was pregnant. The boy could speak in the womb before the child was born.
The male lead was from the royal family.

Answer 1

The book " Agent Poisonous Concubine: Marry You with the Throne " fit the description of the problem. The female protagonist was a secret agent who had transmigrated into the Tang Clan's legitimate daughter. Her mission was to protect the Cat's Eye Stone, but she was plotted against by all parties. In the end, because of the Cat's Eye Stone and the conspiracy, she married the male protagonist with the throne and became the Empress.