"Little House on the Prairie" actress Melissa Gilbert opens up about her relationship with actor Rob Lowe and the pregnancy that led to the couple breaking up.

Melissa shares with People magazine in an excerpt from her book Prairie Tales that she met Rob when he was only 14 years old and "fell instantly, hopelessly and stupidly in love" with the actor. "I felt like I was starving for Rob. ... He wrote me poetry. He cooed the sweetest messages into my answering machine," she says of her romance with Lowe.

Gilbert says in 1986 Lowe proposed to her and before the wedding, she found out she was pregnant -- that is when things changed for the couple. "Finally, with [Rob's] voice trembling and tears in his eyes he said very softly, 'I can't be a father,' Before I could respond, he said, 'I can't be a husband. I'm so sorry,'" she describes in her book about their breakup.

The actress ended up having a miscarriage that, she says, left her feeling "totally alone."

"I had lost my baby and my relationship with Rob. ...and it hurt like hell."

For more of Gilbert's account of her relationship with Lowe, check out the latest issue of People magazine.