Firstly:

Go to this website and see if you turn up in the results.

User Posted Link

You may appear in their database, and if you reuse passwords, they've simply copied to see if you use them in other places.

Go and get a free copy of Malwarebytes from here, and run a scan on your PC to see if you've got a root kit / keylogger on your PC...

User Posted Link

Good luck!

Posted By: Bungle, Oct 22, 12:36:56