The Loose Women panelist, now 31, made the frank admission in her new book, after admitting she felt "ashamed" about having a baby at such a young age.
She explained that becoming a mother to Zachary, 12, while she was still living at home with her family saw her focus on tidying, as it allowed her to get some control back in her life.
Writing in her book Tap to Tidy, which is being serialised by the Daily Mail, Stacey said: "At a young age - I was just 17 when I became pregnant - I became a mum myself.
"That meant there was me, my brother, my sister, my baby son, Zachary, and my mum all living in one small house, with no space to be messy.
"As such a young mum, I felt completely out of control and out of my depth.
"I had no idea what the hell I was doing; it felt like all my decisions had been made for me and there was nothing I could do about that."
She's since added: "I just remember feeling so ashamed. I know that sounds awful but when I was pregnant with Zach, all I felt the whole way through was shame,"
"I looked like a baby as well. I looked about six. I think people just looked and were like, 'ugh, why is she pregnant?' Maybe it's a bit of a trauma I just haven't addressed."
Stacey, who is also mum to Leighton, eight, and one-year-old Rex, continued that mastering small jobs such as tidying, or stocking up on baby supplies, helped her feel more in control.
Stacey is now one of the nation's sweethearts, winning millions of fans for her frank and honest portrayal of home life with three children.
Her partner, presenter Joe Swash, proposed to her during the Christmas holidays last year, with the pair now preparing to marry.