I had my implant removed in April 2011 (I had regular AF for the 3 years I had the implant). We have been TTC ever since. After 12 months I when to see my Dr and she said it could take up to 18 months for it to be out of my system. June last year we got to see a FS after countless tests, a HSG and Sperm Analysis we found out my ovulation wasn't strong enough. FS put me on 6 rounds of Clomid, it made my ovulation stronger but we still haven't conceived. We are trying some natural cycles (to save money) then back to FS for IVF in the new year.
But on the other end of the scale my sister in law had the implant in twice for the full 3 years (6 years in total). She fell pregnant very quickly after the second was removed and has 2 beautiful girls an almost 3 year old and a 15 month old.
Good luck, baby dust and fingers crossed that you are able to conceive quickly.