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It can take up to a year, sometimes longer, for a woman's cycle to get back to normal after being on Depo. Even one shot can significantly affect your hormonal cycle. Talk to your doctor, he or she should be able to answer any questions you have and can do some tests to give you an idea of what's going on with your hormones.
I don't know if you would consider this a cycle or not, but I bled for one day then stopped... Is that considered a cycle?
A "cycle" is a regular menstrual cycle where you ovulate, have your period, etc. I don't know if that's what happened with you, only your doctor will be able to figure out what's going on with your hormones.