If the Lord Bao hadn't set a deadline, which is to be pregnant within a month, Shuiyue and Jinghua wouldn't be in such a hurry.
They're women and know best that getting pregnant can only happen through chance.
For instance, wanting to get pregnant today doesn't necessarily mean it will happen.
So, if after one month they still cannot bear Luo Yang's child, Shuiyue and Jinghua would be in trouble.
They've been with Lord Bao for so long, they're very familiar with his cruel ways of punishment.
If they fail to complete the task in time, Shuiyue and Jinghua would rather commit suicide than let Lord Bao take action.
Now, while they still have the chance to live, they certainly won't miss it.
It's not that Luo Yang doesn't know that pregnancy for women is a complex matter. It's not something that happens just because you want it; he just wants to mull it over for a night or two.
If he truly can't think of an alternative way, he'll definitely help Shuiyue and Jinghua.