Transmigrated as a Prince's Concubine, I Win by Raising Kids

Transmigrate into a book + household and palace intrigue + no System or pocket dimension

When Wei Jinglan opened her eyes, she discovered that she had become the lowest-ranking concubine in the rear courtyard of Prince Xuan’s residence.

Above her were the Princess Consort, whose maternal family was powerful and whose methods were ruthless, and the arrogant, flamboyant Secondary Consort, who was enjoying the Prince’s favor. Lurking in the shadows were a palace maid who had been reborn and entered the household alongside her, as well as a transmigrated woman of extraordinary intelligence, both watching her closely.

Wei Jinglan only wanted to stay alive.

She had no System or pocket dimension to rely on, and she wanted no part in the household’s conflicts. All she wanted was to stay in her tiny courtyard and die of old age. If she was lucky enough to have a child, she would teach him to read and study, so he could grow up to be a wealthy idler.

But Prince Xuan’s gaze gradually became fixed on her, and he always managed to find her among the flowers. Stranger still, the waistline of that newly tailored lotus-colored silk dress had to be altered three times over five years.

P.S. The male lead is not chaste, but later he dotes exclusively on her.