When you begin to use combined oral contraceptives , your body will require at least 7 days to adjust before a pregnancy will be prevented. You will need to use an additional birth control method for at least 7 days. Some doctors recommend using an additional method of birth control for the first cycle (or 3 weeks) to ensure full protection. Follow the advice of your doctor.
https://www.drugs.com/cons/ortho-tri-cyclen.html (Ortho-Tri-Cyclen is equivalent to Tri-Sprintec hence the link)
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