hello I'm on my second Nexplanon. This Nexplanon was inserted April 2014. I have had no issues up until the last day or so. Just recently I had started feeling like a vibration feeling on the outer part of the arm that my Nexplanon is in. when I get this feeling it is directly across from where my Nexplanon was inserted on my inner arm. i'm a little worried because this is a weird feeling and I never got it with my other one .is this normal? Is this a sign it could be broken or miss functioning?