Is it bad if your on depo shot and you haven't had your period this whole time then after a year spot and could it be a sign of pregnancy?

Depo generally diminishes and then does away with a woman's period. Afetr about a year, a lot of women no longer have a period. It can be confusing, though, so if you feel like you're experiencing symptoms of pregnancy, make sure you see a dr. However, not having a period on deop is normal.