A Lifetime of Rise and Fall

Urgently Looking for an Ancient-Era Novel (I’m Waiting Online, It’s Urgent)

Before she transmigrates, the female lead is a nurse at a modern children's hospital. She loves children, but is infertile due to a medical condition. She transmigrates into the body of a woman in ancient times who has just given birth to twin boys. The male lead, the emperor, and another man are sworn brothers.

Any Palace-Intrigue Stories With a Clever Heroine Focused on Her Career?