two periods in one month πŸ˜©πŸ˜©πŸ€’πŸ’” please help

So I got my period on the 4-11 and then all of a sudden on the 16th I have a super light period and continued to get lighter until today the 19th it's just a tiny tiny bit of spotting
This has never happened to me before, has this ever happened to anyone? What is it? Should I be worried 
In the picture it saids the 16th because that's when I screen shoted it

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