I had my implanon removed on 9/6/12. I've had no period. I took a pregnant test and it said neg. Its been 4 months since removal. Should I be worried?

Not ovulating . If you are not having regular periods then you are not consistently ovulating. The effects if Implanon are out of your system quickly. Pregnancies have occurred as fast as 7 days after removal. Since it has been 4 months this is not likely to be an Implanon effect. Schedule a visit to discuss annovulation and ask to be tested for pcos.