C244 Why not pregnant

"You, you, how did you do it?" Si Yu thought to himself, she didn't take any medicine nor that. How could she not be pregnant? No matter how little knowledge she had, she still knew this logic.

"Are you sure you want to know?" Zhuang Xuan countered with a question and the corner of his mouth revealed a malicious smile. Si Yu immediately stopped talking.

Si Yu hurriedly got up and replied, "Okay