If there is a yolk sac, it is not an empty sac, it proves that the pregnancy is already present, but it depends on where the yolk sac is located, if it is in the uterine cavity, it is an intrauterine pregnancy. If the development is normal, the fetal bud and fetal heart fluctuation can be seen after 3-5 days by pelvic ultrasound. If the embryo is not well developed, there is a possibility of preterm miscarriage, but if it is well developed, the pregnancy can be continued. During pregnancy, you should pay attention to nutritious diet, eat more fresh vegetables and fruits, avoid straining and getting cold, and forbid to eat spicy and stimulating food. If the yolk sac is in the fallopian tube, it is an ectopic pregnancy. The blood HCG level of ectopic pregnancy is not very high, and some patients may have a small amount of vaginal bleeding, which requires timely surgical treatment.