Can't Login & 404 at /wp-login.php

Hi all!

Has my site been hacked? &, if so, is there anything I can do to get it back? Still have access to cPanel.

Had a look a while back & I bookmarked this alternative login link. No idea how I came across it lol.

http://finglasscreenprint.com/wp-login.php?zyqr25xpxhcg1wz6dtlt4

When I login under this link I get a plain white page with ‘error’ written in tiny text top left.

Any help massively appreciated.