Other accepted signs of pregnancy include the following: Presence of a gestational sac in the uterus, seen with ultrasonography typically at about 4 to 5 weeks and typically corresponding to a serum beta-hCG level of about 1500 mIU / mL (a yolk sac can usually be seen in the gestational sac by 5 weeks) Fetal heart motion, seen with real-time ultrasonography as early as 5 to 6 weeks Fetal heart sounds, heard with Doppler ultrasonography as early as 8 to 10 weeks if the uterus is accessible abdominally Fetal movements felt by the examining physician after 20 weeks