At that point, she was only about twenty days pregnant. Zhang Xiaohui herself did not realize, but Gu Qingyao knew.
She had been observing Zhang Xiaohui for the past few days!
In order to understand what was going on in the Zhang family, she often went over in the middle of the night to eavesdrop on them. It was during one of these nightly eavesdropping sessions that she found out that the Zhang family wanted Zhang Xiaohui to get a divorce.
Anyway, she had the interspace, so she was not worried that someone would discover her.
That night, she secretly took Zhang Xiaohui's pulse, and realized that Zhang Xiaohui was already pregnant!
Gu Qingyao was so startled she immediately went to make up a dose of the best medicine that would ensure a safe pregnancy. Then Gu Qingyao knocked Zhang Xiaohui out and poured the entire dose down her throat.
At that point, Old Madam Zhang was making Zhang Xiaohui work hard every day. What if the baby was harmed?