I ve been on the Implanon for almost 3 years (It s due to be removed in March 2013). My periods were regular before. I had my period on December 2nd, I had unprotected sex a week later, & then on the 12th I got my period again. It went away a week later & I had unprotected sex on the 23rd and now I m spotting (it s light pink and brown). I ve been spotting since the 25th. Do you have any idea what s wrong?