There is no exact formula to determine which particular pill is best for you-every woman responds differently to different pills. Despite advertising, essentially all oral contraceptives work equivalently well. For you, the best pill is the one with the least amount of estrogen that does the job. In addition to protecting you from pregnancy, the pill should regulate your periods and some women do need more estrogen for this purpose. Price is another consideration. Most pills are $25-$35 or more per month. Many health insurance prescription plans do not cover birth control pills. The more popular, better-advertised pills can be more expensive. There are equally effective and appropriate pills for you that are less expensive.