Transvaginal ultrasound.
D000368:Aged; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis; D011261:Pregnancy Trimester, First; D011271:Pregnancy, Ectopic / Q000175:diagnosis; D011296:Prenatal Diagnosis; D014463:Ultrasonography / Q000379:methods*; D014621:Vagina