Contraception clinics for Implant and Coils. Contraceptive implant EffectivenessOver 99% effective at preventing pregnancy.Less than one in 100 implant users will get pregnant in a year. How it worksA small, flexible rod is put under the skin of your upper arm. It releases the hormone progesterone. It stops ovulation (releasing an egg), thickens cervical mucus … Continue reading Contraception