If we're relying on anecdotes, my wife was born while her mother was on the pill, and used a condom, and something else (I know she claims 3 types of birth control were used).

I've used condoms for 20 years and never had a pregnancy.

http://www.foxnews.com/story/0,2933,366741,00.html
1-2 percent get pregnant on the pill with perfect usage.

http://goaskalice.columbia.edu/explanation-condom-failure-rates
2-3 percent get pregnant with condoms with perfect usage.