SI.com reported that the 37-year-old Fox underwent gender reassignment surgery in 2006 along with the supplemental hormonal therapy.

On Saturday, Fox knocked out a woman in 39 seconds at a fight in Coral Cables, Fla. As an amateur and professional, Fox holds an undefeated 5-0 record with all five wins coming in the first round.

On her license application for the bout, which was obtained by MMAjunkie.com, Fox said she had been licensed by the California State Athletic Commission, which likely helped procure a license in Florida. The California commission, however, said Fox's license, which was submitted in February and included medical documentation, was under review and not approved.

The FSBC confirmed that Fox received a pregnancy test per commission rules, but was not drug tested.

CSAC Executive Director Andy Foster said the commission was in the process of changing its forms to eliminate confusion over a receipt (which reflects a $60 licensing fee) that he believes was interpreted by Fallon as a license.

Fox told MMAjunkie.com that she didn't knowingly misrepresent herself to the Florida commission and thought she had been approved by California.

In the meantime, Fox's next bout, which was scheduled for April 20 as part of a semifinal bout in an eight-women tournament at 145 pounds, is on hold as her promoter, Championship Fighting Alliance, has canceled the event in a show of support.

"We stand 120,000 percent behind Fallon," CFA CEO Jorge De La Nova said. "She's a female. She's a very sweet girl. There's a lot of money on the line for her, and she's performed very well. We're going to give her a couple of weeks to see how this thing turns out."

Marrocco writes for MMAJunkie.com