Estimated incidence of pregnancy by duration of amenorrhea.
D000028:Abortion, Induced; D000328:Adult; D005260:Female; D006801:Humans; D008598:Menstruation; D011247:Pregnancy; D011259:Pregnancy Tests, Immunologic; D011261:Pregnancy Trimester, First; D013997:Time Factors; D014619:Vacuum Curettage