Robyn Polston, 43, of Washington, was arrested on preliminary charges of criminal sexual assault and child pornography.
Police in Washington, Illinois, conducted a thorough investigation into alleged sexual assault of a minor, which led to her becoming pregnant with the victim's child earlier this year.
The victim was Polston's daughter's ex-boyfriend, a 14-year-old boy, according to reports.
Police began investigating Polston after they received a complaint alleging she had engaged in a sexual relationship with a minor.
Author's summary: Woman arrested for sexual relationship with minor.