depo shot pls help a sister out

claire🐻
right so I got the depo shot in June, then a few weeks later I got my period. but then i kept spotting. it's been about 10 weeks and I've been spotting every. damn. day. 
I decided not to continue the shot for some reasons but...
spotting for this long is unnecessary. 
I know some people said it happens with this but why?? and is there anything I can do to make the spotting stop??

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