RT Book, Section A1 Bernstein, Helene B. A2 DeCherney, Alan H. A2 Nathan, Lauren A2 Laufer, Neri A2 Roman, Ashley S. SR Print(0) ID 1159952371 T1 Normal Pregnancy & Prenatal Care T2 CURRENT Diagnosis & Treatment: Obstetrics & Gynecology, 12e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9780071833905 LK accessmedicine.mhmedical.com/content.aspx?aid=1159952371 RD 2024/04/24 AB ESSENTIALS OF DIAGNOSISPregnancy is confirmed by the presence of amenorrhea and a positive pregnancy test.It is crucial to diagnose pregnancy as soon as possible to initiate appropriate prenatal care, avoid teratogen (an agent that causes a deleterious fetal effect) exposure, and diagnose nonviable or ectopic pregnancies.