I interviewed this past week at one of the regionals and got the offer of employment pending the background check, drug test, and such. My only concern is that with the overwhelming stress of the interview I forgot to mention my shady college career, where I ended up dropping out/flunked out before starting my flight training.

Is this something that pops up on their background checks? If it does, is it something that could cost me the job? Should I call the HR lady that did my interview on monday and explain so they know I'm not trying to hide it? I've talked to some friends about it, and they seem pretty divided on if I should be worried or not...