Implanon is sub dermal contraceptive
method,used for 3 yrs and effective more than 99%.
But there are some side effects & it varies to woman like irregular period including prolonged amenorrhoea, wt change, headache, DVT, abdominal discomfort, nausea, fatigue, mood swing
You also get negative pregnancy test. So don't be much worried and clear your doubt by doing blood test
Avoid stress, take healthy diet, control body wt and proper sleep along with Tab Fluoxetine
20mg OD if needed. Consult with your doctor and periodic health check up needed.