Can a finalized divorce be voided if the wife knowingly did not tell the judge about being pregnant?

Couple of divorce lawyers said divorce can not be finalized while the wife is pregnant. So a friend of mine's wife did not tell the judge she is pregnant in order for the divorce to be finalized. Can the divorce be void if the count find out but it's already finalized? Can she be in any trouble? This case is in the state of Ohio.