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How long does it take for the birth control shot to work?

I just started doing the shot on December 8th (First shot ever), I also just had sex and I want to make sure everything is going to be okay.. Please give me all the information you can. I'm just worried that IF its possible to get pregnant at this point that my baby will be okay..

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Birth control with Depo-Provera (one kind of birth control shot) begins immediately after the first shot if given within the first five days of your menstrual period. You're usually always advised to use a back up method of birth control for at least the first week or two with any birth control. It is always possible to become pregnant while using any type of birth control because none is 100% effective.

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How long does it take if it wasn't taken on the first five days of your menstrual period?
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