Hi thanks for your question.
Relax your not pregnant,
Irregular bleeding is side of effect of implanon
After on year of use, in some patient it almost stops the bleeding which is normal and fertality returns after removal of implant.
It is very effective contraceptive
and failure chances are very very less.Polyphagia
(increase hunger) and poylurea(increase thirst) are two classical symptoms of Diabetes
,so get your blood sugar done to rule out or confirm diabetes,before going for further investigation for your symptoms.Hope this answers your question.