You are working in a busy OB/GYN office, and the last patient of the day is P.B., a 36-year-old who is planning to get married soon. She wants to use birth control but is not sure what to choose. Her fianc is in law school, and they do not have health insurance, so she is anxious not to get pregnant right away. She asks you to review the various methods and help her explore what is best for her. What are the main advantages and disadvantages of the contraceptive methods in the highly effective category?