I got the depo shot in July to slow down my bleeding after my Dr found a mass in my uterus. I just started to get my period again in January and that was just spotting and old blood. In February I got a regular period but it was short and still spotty with old blood, March was completely normal. Now its April and I'm still waiting for it to show. All of the ones before came on schedule. Is this fluctuation normal or could something else be going on?