A pregnant 16-year-old allegedly kidnapped at knifepoint by her abusive estranged boyfriend has been found with him in Mexico, according to her mother.

An Amber Alert had been issued Monday for 4-months-pregnant Ashlee Crocitto after she was apparently taken from her mom's house in southern California Saturday by 20-year-old Carlos Antonio, who is reportedly the father of her unborn baby.

Chula Vista Police told FOXNews.com that Antonio was lying in wait for Crocitto before he jumped out at her wielding a knife and forced her into his car.

Crocitto's mother, Bobbi Crocitto, told FOX that police had contacted her with the news that her daughter was found safe in Mexico with Antonio.

Ashlee Crocitto was reportedly taken at about 8:45 a.m. Saturday by Antonio. Her tearful mother said Monday that she was sure the alleged abduction wasn't a plot by her daughter to run away with her former boyfriend.

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Police concurred and said they'd been treating the case as an actual kidnapping.

"There doesn't appear to be any doubt that it was not voluntary," Bernard Gonzales, a public information officer with the Chula Vista Police Department, told FOXNews.com on Monday. "There's always a possibility that it was an act, but we don't operate under assumptions. We take it seriously."

Gonzales said Crocitto was apparently pregnant with Antonio's child and at some point the pair had been girlfriend and boyfriend, but he couldn't say whether the couple was still together. Various local media reports indicated the teen had recently broken up with Antonio because he was abusive.

Crocitto called home a few times since Saturday to tell her mom she was all right.

Police released a description of the vehicle Monday. Antonio had spoken of fleeing to Mexico, according to Gonzales, but authorities initially believed they'd managed to stop him from crossing the border.

FOX News' Catherine Donaldson-Evans contributed to this report.