Hello oncegirl,
Here is an excerpt from the Proctor Exam FAQ:
If you have questions about your exam, you may call your instructor at 1-888-427-1000 and they will review your exam with you over the phone. You will not be provided with a copy of your exam, nor will the exam be returned to you.
I hope this helps you figure out why you received the grade that you did. Contacting them and figuring it out may also help you with your retake of the exam if it is required. Best of luck!
2017 Student Ambassador