A member asked:

How long does it take the depo shot to prevent pregnancy after the first injection if injection was on 2nd day of period?

A doctor has provided 1 answer

Understanding med: The prime benefit of depot shot or similar hormonals in pill form is the prevention of ovulation (releasing an egg) by making the body think you are already pregnant. Since most ovulate mid-cycle, the timing is an issue.If you ovulated the day you got the shot,or soon after, it wouldn't prevent you from getting pregnant.Most recommend a backup form of BC for at least a few weeks if not a month.

Answered 5/12/2016

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