if you got in a fit in berks county

In general, jurisdiction is where the criminal act occurred.  If the entirety of the criminal episode occurred in Berks county then charges in Lehigh would be inappropriate.  However, there are exceptions to this rule.  For instance, if the episode included conduct in Lehigh and only the fight occurred in Berks the District Attorneys can agree that the charges be brought in Lehigh County.  You should consult with an experienced local attorney to evaluate the complete facts of the case.  Self help in a complicated issue like this is a risky proposition that can end poorly.