i had implanon put in when ds1 was a few weeks old, but had to have it removed after 6 months, i was one of the unlucky ones it made me very sick, had heavy bleeding that started within weeks of it being placed, witch lasted untill it was removed, i also had trouble with the removal, as im a fast healer, after just 6 months my muscle had started to heal arround it! (yuck) but i didnt go on anything after it was taken out, as we decided we wanted another when ds was one, so like you, didnt realy try, but didnt stop it if it did happen, 6 months later on ds1's forst birthday we were about a month preg, just found out but wernt saying anything.
thought id share my story and hope it helps!