If there is no egg than there is no pregnancy. They also cause changes in the lining of the uterus and cervical mucus. Advantages Implants work up to five years or until they are removed. Fertility returns immediately upon the removal of the implants.
Implants help protect against uterine cancer.
They can be used safely after child birth and while breast-feeding. Implants do not interfere with sexual intercourse. Disadvantages - Implants cannot be used by women with liver disease, breastcancer, unexplained uterine bleeding, or blood clots. They may not be good for women with high blood pressure, gall bladder disease, elevated cholesterol,irregular periods, light periods, headaches, or heart disease. Possible side effects include irregular bleeding, prolonged periods, light periods, hair loss, decreased interest in sex, acne, and depression.