If the yolk sac is seen on ultrasound in the early stage of pregnancy, it is not possible to completely rule out gravidarium because it may be partial gravidarium, which still needs to be followed up and reviewed, and do not make blind judgment on your own so as not to delay and aggravate the condition.
There are two types of hyperemesis gravidarum, complete hyperemesis gravidarum and partial hyperemesis gravidarum. Complete hyperemesis gravidarum has no embryonic or fetal tissue, while partial hyperemesis gravidarum has only a part of the chorionic villus in the form of blisters, which is combined with embryonic or fetal tissue, but is often accompanied by embryonic developmental delay or multiple malformations.
The presence of a yolk sac on ultrasound in early pregnancy does not exclude gravidity. This is because in partial gravidity there is also an image of the fetus in the uterine cavity, but most of the fetus is associated with malformations and early miscarriage occurs, and most patients present with incomplete or induced abortion, in which case the diagnosis can be clarified by sending the miscarriage to a pathologist for examination.
Early pregnancy ultrasound suggests the presence of a yolk sac, and follow-up review of the development of the embryo buds and fetal heart is also needed to completely rule out the possibility of hyperemesis gravidarum. If there is vaginal bleeding in early pregnancy, prompt medical attention is recommended.