Foul play could be involved in the case of a missing pregnant woman, Ohio police said Monday, as they subpoenaed her cell-phone records and those of her married boyfriend in order to determine what happened to 26-year-old Jessie Marie Davis.

"We feel that there possibly is foul play, however we're still investigating it as a missing person," said Stark County Sheriff's Chief Dep. Rick Perez at a news conference Monday.

Investigators are working to piece together a timeline for the missing woman, who was last heard from on Wednesday night when she spoke to her mother around 9:20 p.m.

"At this time we have no persons of interest, we have no suspects," Perez said.

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Around 70 searchers canvassed the area near the woman's North Canton, Ohio, home Sunday afternoon for the nine months pregnant woman.

Davis' mother, Patty Porter, tearfully asked searchers to look for her daughter as if she were one of their own.

"I want them to know it could have been them or their daughter," Porter said. "I want them to look with that intensity."

Porter reported her daughter missing Friday after finding her daughter's 2-year-old son, Blake, home alone on Friday morning.

"I said ... 'Where's Mommy?'" Porter said. "And he just said, 'Mommy broke the table, and Mommy's in the rug.'"

The toddler told the police the same thing when they interviewed Blake, Perez said.

Davis' house showed no sign of forced entry, but her cell phone, comforter and sheets were missing from the residence, Stark County Sheriff Tim Swanson said. Her purse and vehicle were found at the home.

"The mattress was partially off the bed and the nightstand was knocked over and the lamp was knocked over and somebody had poured bleach all over the floor," Porter said.

The woman's sister, Jane Davis, told FOX News on Sunday it appeared her sister had been missing for a day to a day and a half before her mother discovered the 2-year-old. Porter said it was unlike her daughter to leave the boy alone.

"He was her whole world. She wouldn't even shut the bathroom door with him out there, let alone walk outside," Porter said. "She would never leave him. The only way that he was left was if something happened."

That Blake was left home alone was the prime reason police suspected that foul play may be at work, Perez said Monday.

The father of Jessie Marie Davis' toddler and unborn child is Bobby Cutts Jr., a Canton, Ohio, police officer. Both Cutts and his wife, from whom he separated in February, have been questioned and are not suspects, police said.

"At this point he's doing everything he needs to do to cooperate with police to help us find her," Jane Davis told FOX News.

Cutts was among the 60 to 70 people who helped search for Jessie Marie Davis on Sunday.

Authorities have canvassed Davis' neighborhood several times and used a canine unit to try and pick up her scent, but until they get new clues, the search has been suspended.

"It's a nice neighborhood. It's a quiet area," Jane Davis said. "It's a safe place to have a family, and no one saw anything."

Davis is described as a 5-foot-4-inch-tall white woman with brown hair and hazel eyes. She is nine-months pregnant and weighs approximately 135 pounds.

Anyone with information is asked to contact the Stark County Sheriff's Office at 330-430-3818, a number dedicated to Jessie Marie Davis tips. An eTip page on the department's Web site has also been set up at http://www.sheriff.co.stark.oh.us/mr070616%20etip.htm .

"We want people to call in as much as they can," Perez said.

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FOX News' Jeff Goldblatt contributed to this report.