If it's been filed then it is very unlikely that it will be dismissed. The stipulation for probable cause is likely the basis for the filing. May I suggest that you have a criminal defense attorney review the documents that you signed. Many reputable criminal defense attorneys offer a free consultation. The price is right so contact a few. Good luck.
The response above is not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.
There are some issues here that are not clear. For example, who did the sergeant file the case with? This may be a case in which the final determination of filing comes from the D.A.'s office. If so, then the sergeant has referred it to the DA for review and filing.
In the meantime you may check with the court clerk's office to see if you are scheduled for a hearing.
This does not create an attorney-client relationship. That costs money and this is free.