Did my gst backpay come early?canada?

I didn't do my taxes in 2010 and I did them this year and was told I would get my back pay. I was also told I would get my back pay when next gst cheques came in july. But I got a random payment into my bank account a couple days ago from fed/prov-terr? Do you think that would be my back pay? Or what else could it be? Thanks