Upgrading to Windows 10 10547 Bitlocker-ed one of my hard drives?

[Windows Central Question]

Overnight my computer upgraded via Windows Update to Windows 10 Pro preview 10547. After the reboot, I logged in and discovered that my D: drive was protected with Bitlocker. I did not configure Bitlocker. As such, I don't know the password, or the recovery key. My D: drive contains my user profile and all of my data, so even things like my desktop are unavailable. It could be a coincidence on the timing? But I haven't made any other changes to my PC recently. Any advice would be appreciated.

 

[MoshMast]

If your Windows installation was tied to a Microsoft Account you should be able to access your Bitlocker recovery key online.