One of the attachments have come loose, will it be okay until I can see my orthodontist?

Q. Hello I\’m in the early stages of the Invisalign treatment and have to say that it is going extremeley well. However, yesterday one of the tiny attachments came free from my tooth. Is this something which will need fixing urgently or will it be okay to leave it for a few days? I\’m struggling to make an appointment with my orthodontist but am concerned about harming the treatment process. Many thanks, Robert,