Consider

A progesterone-only contraceptive given as an injection into the muscle.³
WORKS BY suppressing ovulation and thickening cervical mucus.³ Frequency of injection is once evry 12 weeks.³
EFFICACY:²
Typical use: 96%
Perfect use: 99.8%

A small plastic rod inserted under the skin of the upper arm about the size of a matchstick that releases a progestogen slowly over a three year period.⁵
WORKS BY suppressing ovulation, thickening the cervical mucus to slow down sperm and making the uterus an uninviting place for an embryo.4
EFFICACY:²
99.95% (lasts up to three years)

A small, T-shaped plastic device that is inserted into the uterus by a trained doctor and steadily releases a progestogen over five years.¹,⁵
WORKS BY acting locally on the lining of the uterus to prevent implantation of fertilized eggs, also thickens the cervical mucus to slow sperm down and in some women suppresses ovulation.⁴
EFFICACY:²
99.9% (lasts up to five years)