Hey, me and my wife were surprised when we found out my she was pregnant, but we had followed said rules:
1. WE ARE MARRIED.
2. WE ARE IN LOVE
3. WE ARE FINANCIALLY READY.
If you cant do so, dont have unprotected sex. It will probably save you from the clap, herpes, or in the worst case AIDS. DUUUUUUUUUUUUUUH!
I have three gorgeous boys who are living proof that condoms, when used correctly and consistently, are not 100% effective. If you have enough sex, eventually the long arm of the law of averages is gonna gitcha.
Abstinence and surgical sterilization, that's as close to 100% efficacy as you can get. Pregnancy should always be the planned outcome of sex, no matter what form of contraception one chooses to employ.