The things to pay attention to during the ultrasound examination of early pregnancy are: first of all, the pregnant mother should hold her urine and let her bladder fill up, because in early pregnancy, the shape and size of the uterus do not change much, so it is important to let the bladder fill up to facilitate observation. During the examination, it is important to look for the echo of the gestational sac in the uterine cavity. If the menstruation is normal and very regular, the gestational sac can usually be seen at about 40 days of pregnancy. The normal gestational sac is echogenic, round or oval with slightly enhanced peripheral echogenicity. After seeing the gestational sac, it is important to observe if there is a yolk sac inside and if so, to observe if there is a germ growing next to the yolk sac. After these observations, the adnexal area should be observed for any occupying lesions bilaterally. It is important to note that if no gestational sac is found in the uterine cavity at about 40 days of pregnancy, it is important to focus on the fallopian tubes and ovaries bilaterally to see if there is an echogenic gestational sac to rule out ectopic pregnancy.