I had implanon birth control inserted one week ago into my left arm, yet was told it should be between biceps and triceps, whereas I realized upon removal of the bandage that mine was on top of my arm, above the bicep muscle. Does this affect the efficacy of the rod? I have had zero bruising or pain, yet the area is sensitive to touch and has a dull ache when I use my arm (normal use, no weight lifting). Is this normal or should I be concerned? The rod does not seem to be inserted into the muscle though, I can feel it quite clearly through my skin. Thank you.