If you ordered the Epic Fan Edition (item #1336 for US$ 32) then you only qualify for beta access. If you ordered the Legendary Fan Edition (item #1337 for US$ 48) then you will be able to take part in the alpha.
Are you still using the same email address? Then go to Retrieve Game-Keys. The email you will receive will either state you have a Pioneer (formerly: Epic) or Patron (formerly: Legendary) key. If you are not using it anymore, then contact Crate for updating your email address:
The original pricing was adjusted for the Kickstarter campaign. The new pre-order editions have kept the Kickstarter pricing.