How does the contraceptive injection work?
The progestogen is injected into a muscle or under the skin and then is gradually released into the bloodstream. It works mainly by stopping the release of the egg from the ovary (ovulation). It also thickens the mucus made by the neck of the womb (cervix) which forms a mucous plug. This stops sperm getting through to the womb (uterus) to fertilise an egg. It also makes the lining of the womb thinner. This makes it unlikely that any egg that has managed to be fertilised will be able to implant in the womb.
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