Welcome to ATD. Thank you for the query.
The medication usually starts working right away when the rod is inserted on days 1 through 5 after the start of your regular menstrual bleeding. If your appointment is at another time in your menstrual cycle, you may need to use a non-hormonal form of birth control (e.g., condoms, diaphragm, spermicide) for the first 7 days after the rod is placed. Ask your doctor about whether you need back-up birth control.
The failure rate of nexplanon is .05% for both perfect use and typical use because the method requires no user action after insertion.
Hope this helps.Take care.
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