Hi,
You should probably call your doctor's office, explain what is going on, and ask them to advise you on what to expect for the next few months. From my experience, Depo can do weird things to your periods once you stop the routine injections. I also learned that when it comes to stopping Depo, the results can be different for each woman. Some women get their periods back soon after stopping the injections, and some don't have their periods until months later. My first experience after quitting Depo, was a light period after 4 months of waiting for it to appear again...
Good Luck