IF i do not testify and plead the 5th can i get in any trouble and will they drop the charge?
Do what your lawyer said. The case will likely be dropped and you will not be in trouble for pleading the 5th. But do not engage in any discussion with the prosecutor aside from telling him you want the case dropped and will plead the 5th if subpoenaed to testify. If the prosecutor learns from you that you made it up then you are in danger of being charged for filing a false police report.