This chapter provides detail description of Routine ultrasonography in pregnancy. Chapter has 19 well illustrated diagrams and pictures. First trimester ultrasound, normal sonographic appearance, ectopic pregnancy, nonspecific findings of adenexal mass and tubal ring, early pregnancy failure, fetal anomalies, first trimester masses and Doppler ultrasonography in obstetrics are described in detail. One table is added to highlight normal transvaginal sonographic findings. One flow chart is included to depict early intrauterine pregnancy. 29 references are included at the end of the chapter to facilitate further reading.