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http://en.wikipedia.org/wiki/Combined_oral_contraceptive_pill#Formulations
Formulations
Oral contraceptives come in a variety of formulations. The main division is between combined oral contraceptive pills, containing both estrogen and progestins and progestin only pills(mini-pills). Combined oral contraceptive pills also come in varying types, including varying doses of estrogen, and whether the dose of estrogen or progestin changes from week to week.
Progestin only pills:
http://en.wikipedia.org/wiki/Oral_contraceptive_formulations
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