From the book:

On a winter's night, about two in the morning, the Comtesse Jeanne d'Herouville felt such violent pains that in spite of her inexperience, she was conscious of an approaching confinement; and the instinct which makes us hope for ease in a change of posture induced her to sit up in her bed, either to study the nature of these new sufferings, or to reflect on her situation. She was a prey to cruel fears, - caused less by the dread of a first lying-in, which terrifies most women, than by certain dangers which awaited her child. In order not to awaken her husband who was sleeping beside her, the poor woman moved with precautions which her intense terror made as minute as those of a prisoner endeavoring to escape.