From the time you stop Depo and possibly up to one year, you might notice that your cycle seems off schedule, or very light. You can get pregnant during this time, even if you don't have 'normal' periods ~ so be very careful, if you don't want to get pregnant during this time. If you do want a baby soon, it is possible for you to become pregnant before your periods become normal again, from my experience...
Hope this helped you :)