Was hired at Safeway on May 8, 2012, during my probation I missed 4 days and was given a final warning on June 11, 2012 that if I missed one more day I would be terminated. I didn't miss anymore days from work, when the schedule for the week of 07/01-07/07 was posted I wasn't on there. On 07/07 went in to check the work schedule for the week of 07/08-07/14 I still wasn't on there, the manager that was there that night gave me no answer on why I wasn't on the schedule. The morning of 07/15 I called instead of going in there and was told to talk to one the managers the next day.
Long story short I've called union reps, and human resources to see what should I do next because after talking to another employee he told me that one of the managers told him I was terminated ( why was my status disclosed to other employees? ) . I called the gm and he told me the store manager told him I was let go due to my attendance 0__o... but I never was told to my face, pink slip in the mail, over the phone, through a email so is this wrongful termination and can I sue?

Doesn't sound like wrongful termination to me. It was a badly handled termination, but not wrongful.

Since this is a union job you need to bring it up to your union reps. But if they won't support you, then its time to look for another job.

As you where still under your probationary period I doubt you have any recourse at all.
I'm very surprised that they didn't terminate you earlier to be honest as four days absence doesn't demonstrate the dependable behaviour that would be expected of a new starter.