Inadvertent pregnancies in oral contraceptive users.
D000293:Adolescent; D000328:Adult; D003276:Contraceptives, Oral; D003279:Contraceptives, Oral, Sequential; D005260:Female; D006801:Humans; D011247:Pregnancy; D012307:Risk Factors
D003276:Contraceptives, Oral; D003279:Contraceptives, Oral, Sequential