It is important to check your Spam, Junk, and Promotions (Gmail) folders for the appointment reminder. This email will come from the email address: firstname.lastname@example.org
The appointment reminder email is connected directly to a setting within the doctor's Practice Fusion account, so the feature to send appointment reminders may have been disabled. You will want to confirm with your doctor that this feature is active within their Practice Fusion account.
Appointment reminders are sent to the email address on file for you with your doctor, you will to want to ensure that your doctor has the correct email address on file for you.
Finally, you may not have received this appointment reminder if the appointment was scheduled within 24 hours of the appointment. These emails are sent out one week and one day before the scheduled appointment.