I had my Implanon in for 5 years. One in for 4 years and another put straight in after that until June this year. My periods were non existant for the first implanon but when I had to replace it and got the second one put in I suddenly remembered why I hated being a female so much. I got my AF all over the shop. I was so irregular and so moody. I couldn't work it out.
Since getting it out and TTC the doctor advised me that it only takes 24hrs to 4 days to get your body back in order. THIS actually freaked me out because I didn't think it would happen so soon. But low and behold I got my AF the exact same day I had the implanon removed and my periods have been regular ever since.
Im actually 12DPO and awaiting to take my HPT. Cant wait to see the result.
I hope this info helped.