If this is the only suspicious belief you are now experiencing, I would sit with it. See if anything else develops. In my experience, when I have been delusional and psychotic (many, many, many times), it has almost never been isolated to one, single belief. Usually, it is a whole series of things. People following me. Entering my apt. while I'm gone so they can go through my meds and see if I am taking them or not. IR cameras in the upstairs apt. spying on me. Agents placed in my apt. building posing as residents. On and on. These are all real, recent beliefs of mine that I still struggle with today.

Anyhoo, hopefully, this just remains the one thing. Sending you hopeful, calming vibes. Hang in there. You can get through this.