Court papers filed by Laura Kaeppeler, 31, claim her husband "grabbed" her and "forcibly pinned" her up against a wall, demanding that she get an abortion.
Kaeppeler alleges that Fleiss, 55, became enraged when he learned about the pregnancy because when they got married they agreed to have just one child.
"Mike threatened me that if I did not have an abortion, he would end the marriage," she said in court papers.
She also submitted a photo she said shows bruises on her arm as a result of the alleged attack.
Fleiss denies his wife's allegations, claiming in court papers obtained by The Blast that it was Kaeppeler who was the aggressor and writing that she "physically attacked" him.
"I tried to get away from her as she was chasing me and hitting me," he said, according to the papers.
Kaeppeler, a former Miss America, met Fleiss when she won the crown in 2012 while he was acting as a judge in the competition. They married two years later, with "Bachelor" host Chris Harrison officiating their wedding.
Fleiss filed for divorce last week. Kaeppeler has been granted a temporary restraining order against Fleiss pending an Aug. 6 hearing, court papers indicate. She is approximately 10 weeks pregnant, according to court papers.
ABC, which airs "The Bachelor" and its associated spin-offs, has not commented. But a spokesperson for Warner Horizon, which produces "The Bachelor," said in a statement: "We are aware of these serious allegations, and are looking into them."