titanfall key

Heyo!

So for a while I've been off my computer due to college work n stuff, and I've barely gotten back on board with games and wanted to play some Titan Fall. However, when I went to log into my Origin after it updated, it asked for an activation key for my Titanfall. Im confused because I already purchased and used that key, and since lost tract of the Key i wrote down while moving into my dorm and such.

How can I get this key back if i deleted the email and cant find it in the trash bin? Will I have to buy it again? (I originally got it on sale for $20 dollars (I think))

Any help is appreciated. Thanks!

EDIT: I feel pretty dumb now, delete this if you will. Apparently I had a second account I made, but never remembered it.