I got pregnant while on the depo-provera shot, what are the chances of birth defects?

Very low: Accidental pregnancies that occur on depoprovera or other Progesterone only birth control methods did not put the fetus at risk above the normal baseline risks.

2-4% like EV1 else.: Depo-provera does not increase you risk to have a baby with congenital anomalies. That risk is 2-4% for anyone attempting reproduction and reaching a viable delivery. Take Folic Acid 1-5 mg daily!