hello dear.
understand your concern.
as you said, you are 14,when you implant.according to me its early age for
implantation,may be it can difficulties in future.
I think you have to take another method for
contraception like condom,diaphragm,hormonal tablets & patches....
Implanon have some side effects like,bleeding,amenorrhoea,nausea,
dizziness,loss of appetite,headache,changes in libido,acne,
depression,infection at implantation site,etc...
I hope,this will guide you.
stay safe & healthy.
thanks.
Dr.sagar