thank you for your query.
Implanon is an etonogestrel class of contraceptive
used to prevent pregnancy
the common side effects include spotting and pain at the site of insertion.
You may also have some spotting between periods
, especially during the first several months of use. If bleeding is prolonged (more than 8 days) or unusually heavy, contact your doctor
but having lower abdominal and back pain which is persistent,along with bleeding and numbness of left foot is an serious problem which needs attention right away.
kindly contact your doctor for an appointment and further medical advice
wishing you good health