Is this normal with Nexplanon? Plz read

I just got Nexplanon in a week and a half ago. AF was due yesterday. She still hasn't come yet and I'm used to having super regular periods. I haven't had sex since April.

Is there a possibility she won't come at all or that she is just going to be late? I know irregular bleeding is the most common symptom but I didn't know if it could start right away. Should I be concerned?

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