Quoting ×ø×K·ßear×ø×:" depo can sometimes give off pregnancy like symptoms.. but a test will be able to tell you even on the shot if you are indeed preg"
I can second this as I had issues with it, I was dealing with a lot of pregnancy like symptoms and one of which was actually something similar to lactation. It took multiple pregnancy tests and blood tests to show that I wasn't and after about a year it was finally narrowed down that depo was messing with my body. Not only was I having symptoms similar to pregnancy but I also was having much more severe side effects. If you're worried, do what you need to do.