Does plan b one step pill work if you have your periods?

Plan B One-Step is an emergency contraceptive designed to prevent pregnancy after unprotected intercourse or contraceptive failure. If you are already on your period, the pill will not be effective since it is intended for use before ovulation. However, if you had unprotected sex during your cycle before your period started, it may still work to prevent pregnancy. Always consult with a healthcare provider for personalized advice.