Questions about Implanon (hormonal implant)

Can I move my Implanon or is it sort of stuck? I might have touched it wrong, but I am afraid that I moved it.

I don't get my period anymore? Is that okay? How do I know it is not pregnancy?

How do they remove the Implanon? I only feel the end that is closest to the insertion point. Is that bad?

Edit: extra question/observation: when I lift my arm above my head my implant is much less tangible than when I have my arm resting down my body. Is this normal?