Implantation OR period?

BrieAnna
I spotted on and off for three days, but now nothing. I've never had a period like this, nor am I stressed. Could this spotting be implantation bleeding? According to this app (which I just started) said my period was supposed to start on the September 14th, it didn't start until the 17th, and the bleeding stopped the 19th. But just a side note, my periods are irregular and are hard to track. I'm kind of confused. Plus negative pregnancy test. Any suggestions? Thank you! 

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