You're fine. Basically, you just need to input the actual product code Origin sends you on the SWTOR website to convert to an active account once public launch hits. They will apparently start sending them out on the 16th.
I have already "redeemed" a code that came in an email. I see now that that code is the same as the product code from the details page for the game on origin.
Only diference is that the code on Origin does not have any "-" in it
Should I not have done that?