Coles, 27, who is three-months pregnant, was last seen leaving her apartment near 81st Street and Vernon Avenue on Chicago's South Side.
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Her disappearance has led to over $28,000 in reward money being offered for information about her whereabouts.
Chicago police said last week that "foul play is suspected."
Coles was described as a 5-foot-4, 125-pound black woman with brown eyes, black hair and a medium brown complexion, police said. She has a tattoo of a heart on her right hand and one that reads "Lucky Libra" on her back.
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Anyone with information about her was asked to call the Area South Special Victims Unit at (312) 747-8274 or the U.S. Postal Inspection Service at (877) 876-2455.