Hello,
There is another way.
If you have access to your computer and open the command prompt as admin, you can enter the command below :
manage-bde -protectors C: -get
Manage-bde -protectors : manage protection encryption key
C: : you call the disk
-get : you get the recovery key for your disk
You can change disk letter if it is different.
You can enter the command on google, i'm pretty sure it will explain better than me for non-IT person. :)
Rgds