Deleting my period?

I got on Depo about a month ago and put it into glow that I started depo in march. I tried deleting this period and it won't let me, it's still telling me I'm about to start my period. I haven't had any bleeding or spotting of any kind since I started it. I should have already gotten of my period (if I wasn't on Depo). Every time I try to delete it it just moves it back. How do I delete my period?