The 29-year-old singer said she is worried that her biological clock is ticking and she is running out of time to start a family, reported Contactmusic.
Cheryl had hoped to have kids with her husband Ashley Cole but their relationship broke down in 2010 after he was revealed to be a serial cheater.
Referring to the revelations in her forthcoming autobiography, a source said, "Cheryl worries she's put her career before everything else, including settling down. She is desperate for children and reveals in the book that not only did she think she'd be a mum by now, but that she would have had a family with Ashley if things hadn't gone so wrong.
"She also reveals that she worries she won't have children," it added.
The pop star is now dating dancer Tre Holloway and has recovered from the heartbreak Ashley caused her.