Discharge after Nexplanon implantation?

Lily
I got the Nexplanon on Monday 11/14/2016 and now two days later Wednesday 11/16/2016 I have brownish discharge, is that normal for it to happen so soon? Also I had unprotected sex on my last day of the cycle which was Sunday 11/15/2016. I'm not sure if it's discharge or implantation? Any comments? Thank you!

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