Unplanned pregnancies and the pill.
D001835:Body Weight; D004997:Ethinyl Estradiol / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D009644:Norgestrel / Q000008:administration & dosage*; D011247:Pregnancy
D009644:Norgestrel; D004997:Ethinyl Estradiol