As a domestic violence victim, the police filed the complaint and I have a subpoena, do I have to go to court?

Depends how you were served the subpoena. Personal served or certified mail, restricted delivery & signed for by you, then YES or risk contempt & sanctions up to & including arrest & jail time. If mailed regular 1st Class Mail, there is no proof you were served unless you acknowledge service. Be very careful, courts & local police do not like to have their time wasted. Good luck.