If the allegation is false or inaccurate you need to take it to court. There is no winning in pleading guilty as affirmative finding of family violence has permanent and devastating consequences to the rest of your life. Permanent criminal record, banned from owning firearm or ammunition, child custody issues or even volunteering at school activities will be a problem.
Here are the possible consequences in case you plead or found guilty of the offense:
http://www.ejfi.org/DV/dv-20.htm#consequences
BTW: Why did you plan to plead guilty? Your original post suggests that you already decided to plead guilty to the charges.