If used perfectly there is a 0.3% failure rate with depo provera. Typical use has a 3% failure rate. So yes, it is possible, though very small odds.
Depo Provera is famed as being one of the most effective birth controls available. It is rare that someone will get pregnant while on it. Sometimes women will become pregnant before receiving the shot.
Depo Provera greatly increases the chances of premature birth. You can find more information here: babyhopes.com/articles/depoprovera.html.
There is also a slight chance of women who are taking Depo developing osteoporosis and so it is highly urged they take calcium supplements while using it. In answer the original topic, there are many concerns when taking Depo and one of the smallest is that you will become pregnant when using it. There is almost no possibility of this occurring as long as you keep your shots current and do not miss any scheduled appointments.
In order to ensure that you can bring your chances of getting pregnant down to 0% it is a great idea to add other secondary measures of birth control such as spermicidal foams and/or condoms. It is also very important to remember that Depo will in no way prevent you from contracting a sexually transmitted disease and so safe sex should never be eliminated from your contraceptive plan unless you are in a 100% monogamous relationship in which both partners are tested routinely. It only takes on mistake to become pregnant or to get a life changing illness so it is important that you not take sexual decisions lightly and that you are diligent in protecting yourself, both from pregnancy and disease.
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