with combined contraceptive odds listed. About the only way to get less than 0.01% while using a condom is to use a contraceptive implant. If you use the condom and birth control pills, it's only 98.7% effective. With 74 million women of "breeding age", that means 962,000 pregnant women could become pregnant using that method.
Male Condoms + Combination OCP = 99.99% effective with perfect use - 98.7% effective with typical use
http://www.scarleteen.com/article/sexual_health/the_buddy_system_effectiveness_rates_for_backing_up_your_birth_control_with_a_