When someone starts a new hormonal method of birth control (like the Depo shot), it takes 1 week for the hormones to be integrated enough into the body to start preventing pregnancy.
Once the Depo shot is at full effectiveness, it is preventing pregnancy by up to 99% for 3 months. But in order for the Depo shot to consistently be effective, you need to make sure you’re getting the shot every 3 months.
Since this was your first shot and you had sex before the 1 week, the Depo shot was not protecting you against pregnancy. However, since you used a condom you are up to 85-98% effective protected from pregnancy!
If for whatever reason, there was a chance semen came into contact with the vagina, Emergency Contraception is an option. You can take Emergency Contraception up to 5 days after your most recent sexual encounter, and it is more effective the sooner you take it.
If you have anymore questions or need to make an appointment, call our Teen Clinic! 303-442-5160