Wrongly used student discount code

K1977

I recently ordered something online and whilst shopping I decided to have a look on a few discount code websites, I found a discount for 30% off so copied the code and applied it to my order, it wasn't for anything expensive, my order was under £10 but times are hard and if you can save a few pennies here and there, then why not? anyway after placing my order the discount was applied but when I looked at the order confirmation the discount stated STUDENTSAVE which I assume is a student discount now I'm worrying myself sick as I'm not a student and worried what will happen if the company finds out, will they check even though the orders already gone through and if I don't have proof my order could be cancelled, should I contact the company to say I made a mistake applying the discount or just leave it and hope they don't check?