birth control
"I have only had Implanon since December 6th.  At first, I was super excited because I would not have to worry about birth control, I could have a stress free sex life with my husband.  Well I began my period that morning before the implant was in.  I figured, 5 days, and I would be okay.  My periods have never been just "light days", but that is how this one was.  But, it lasted for about 2 1/2 weeks.  I spent a lot of time reading reviews and trying to determine if this was normal. After reading, I was convinced to wait it out and see if it would go away before contacting my physician. That was great advice. Right now, I feel great. no other effects at all!"