implantation bleeding or period?

Morgan
So I'm on nexplanon (arm implant) and I stopped having periods for the first 7 months and both me and my bf loved it! I got my first period back in May and it last like 20 days 😩
Then in June I had another period and it lasted a week so I thought maybe my periods would come back normally but 4 days after it stopped I bled for 2 more days. Could this be implantation bleeding or my period just being strange because of the birth control? I've never had my period stop for a couple days and then come back 

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