^ There's a reason people recommend using two methods of birth control at any given time, but even then—freak accidents happen. Four nines isn't 0% :P Also wor

^ There's a reason people recommend using two methods of birth control at any given time, but even then—freak accidents happen. Four nines isn't 0% :P Also worth noting that there are about a million birth control pills on the market with different side effects... and different levels of efficacy. Progestin-only pills are popular because people tend to tolerate them well, but they're notably less effective than pills with estradiol in them. Sometimes that's a worthwhile trade-off!