The woman was identified as Karla Vanessa Perez of the northeastern state of Coahuila, which borders Texas. She is currently being treated at a hospital in the state capital Saltillo, the broadcaster said in the report.
Perez, whose age was not given, had fertility treatment leading to the multiple pregnancy, it said.
State-owned news agency Notimex also reported the pregnancy, saying Perez was due to give birth on May 20.
"It`s very early to think of names for the babies," Perez told Notimex. "First I hope that everything goes well."
The successful delivery of nonuplets would be one of the highest multiple births ever recorded.
In 2009, a woman in California gave birth to octuplets, sparking worldwide media attention.
(U.C003)
Editor: Priyambodo RH
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