Your not crazy lol though I can see how you would be concerned I've had the implanon in for 10 months now and my period just decides to come whenever it feels like, could be 3 weeks late, could be 2 weeks early. Don't be concerned about irregular periods however as the implanon reacts differently to different people I had a friend with it in and she didn't get her period for 5 months and she wasn't pregnant so don't stress too much :)
Hope that helps
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