What are the chances of getting pregnant on nexplanon without condom?

Very low: The Nexplanon implant contains a progestin, a hormone, which provides long-acting reversible contraception. It has been called the most effective form of birth control available with a failure rate of 0.05% after proper insertion. Adding a condom to this offers no measurable additional protection. However, also using a condom provides protection from sexually transmitted infection.

Almost perfect: Nexplanon if placed correctly has a failure rate of 0.05%