Savanah Soto was last seen Friday in Leon Valley, Texas, according to police.
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Leon Valley police said Soto was supposed to be induced on Friday, but did not show up at the hospital.
Family members confirmed to KSAT that Soto was found inside her car along with an adult male, who is believed to be Soto's boyfriend, in Leon Valley.
The Kia Optima where the bodies were discovered is believed to belong to the boyfriend, police said Tuesday.
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"It's a very perplexing crime scene," San Antonio Police Chief William McManus said. "Detectives (are) looking at it as a possible murder but we don't know for sure."
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He said investigators have not yet been able to move the bodies and are not sure whether a weapon is in the car.
McManus said the bodies are believed to have been there for three or four days.
A Clear Alert is issued for missing, kidnapped or abducted adults who are in immediate danger. It stands for Coordinated Law Enforcement Adult Rescue.
Anyone with information regarding this endangered missing person is asked to contact the Leon Valley Police Department at 210-812-3259.
The video in the player above is from an earlier report.