irregular period after depo?

I did not get my shot in May my last injection was in February. I have had one period since missing my shot, it was exactly 10 weeks after missing it. My period lasted a week and I had two individual days of spotting within two weeks after. According to period trackers my period should have started two days ago. I have taken pregnancy tests just to be sure and they have all came back negative. Has anyone gotten off depo and had irregular periods afterwards?