how effective is birth control shot?

how effective is birth control shot?
The birth control shot is an effective birth control method. Over the course of a year, about 6 out of 100 typical couples who use the birth control shot will have an accidental pregnancy. The chance of getting pregnant increases if a girl waits longer than 3 months to get her next shot.
Full answer in: kidshealth.org
How effective is the Depo shot?
Although it used to be quoted that Depo - Provera is 99% effective in preventing pregnancy, it turns out that there can be anywhere between 6-12 accidental pregnancies in every 100 Depo users each year. May 29, 2014
Full answer in: my.clevelandclinic.org
More questions like: How effective is the Depo shot?
How long after getting the Depo shot is it effective?
Exactly when the birth control shot starts working depends on when you get it, but it never takes more than seven days to become effective. If you get the birth control shot within the first seven days after the start of your period, you're protected from pregnancy immediately. May 28, 2013
Full answer in: www.plannedparenthood.org