Having problems getting pregnant

JESSICA • I am a 28 year old mother of a 3year old little girl my husband and I got married this last June and are trying to grow our family
I had implanon in planted at my 6 week check up 3and a half years ago and I was supposed to have it out this last June but have not been able to get it out. Every thing I have read said that there should be nothing left in it but we have been trying since July and still have not got pregnant yet. ANYONE have any idea what we can do