Did i install 2.8 or didn’t i?

Hi
I’ve clicked on the message to upgrage to 2.8 and then as i saw i should have backed up my files first, i desperately hit the back button… but too late, well actually, i don’t know what happened, first of all it locked me out of my admin area then when i reset my password and logged in, at the bottom of the page is says wordpress 2.8 but i really don’t know if i upgraded or not!!! I noticed that for example when i try to insert a photo, that button isn’t working anymore so i suspect not. How can i find out?
Would it be better if i just followed the instructions for the 3 step reinstall… that just doesn’t look like 3 easy steps to me… any suggestions? That would be much appreciated!
Thank you!