AirTags

I recently bought an iPhone 11pro. I looked at my new phone yesterday and there was a warning saying “AirTag found moving with you. The location of this AirTag can be seen by the owner”.

I then pressed allow and it showed a red line (route) from the place I work to my home.

I googled “AirTag” and these little tracking devices showed up. Does this mean that one of these devices is somehow attached to my vehicle or does anyone know what this means?