An injunction is not effective if the recipient doesn't know about it. It has to be personally served upon the recipient.
If you don't know if there is an injunction you can assume that there isn't one as you've not received any notice.
An ex parte ('without parties') injunction is an injunction obtained without the attendance of the parties (although usually the applicant does attend). The subsequent injunction is then personally served along with the notice of the return hearing where the recipient has a chance to answer the application.