Around 2 pm the same day. Am I protected?
If you were within the first 5 days of your period when given your first Depo shot, then you were protected immediately.
If not, then you had to use extra protection for 7 days.
Plan B is said to be around 90% effective at preventing pregnancy if taken within the first 12 hours after unprotected sex, & gradually becomes less effective until the latest point you can use it, which is 72 hours later, when it is around 75% effective.
- Plan B Information for Consumers
- Plan B Information for Healthcare Professionals (includes dosage details)
- Side Effects of Plan B (detailed)
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