What're the odds of getting pregnant on yasmin (drospirenone and ethinyl estradiol) and taking the pill on time everyday?

Minimal at best: As long as you take any birth control pill regular at same time every day, your chances of getting pregnant are slim to none. The reason we can't quote "zero chance" is that no one's perfect at taking pills at same time every day, plus there are those few women for who we can't explain. Just remember that bcp can't reduced risk of sexually transmitted disease/infection so need to use condom regula.

Very low: Your chances of oral contraceptive failure if taking regularly and no other factors involved is about 0.1%. In reality, we expect about 2-3% failure rate due to compliance problems and other factors.