Depo, irregular periods, help!!!

I first got the depo shot on April 2nd, and ever since then my last 2 periods have been very irregular, my periods usually last 3-4 days, but my last 2 periods have been 6 days and my most recent one was 8 days, I bled more than I was supposed to and I finally just stopped.
is this regular??? or should I be worried 

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