HCG is also known as human chorionic gonadotropin, and low HCG may cause effects such as fetal dysplasia and fetal arrest. HCG stimulates the secretion of the corpus luteum, preventing the degeneration of the corpus luteum in pregnancy and allowing the fetus to develop in a healthy manner.HCG also plays an immunosuppressive role, which better protects the embryo from damage caused by the mother’s immune system. Low HCG may cause fetal dysplasia, increase the chances of preeclampsia, and in severe cases may cause the fetus to stop developing, which needs to be combined with ultrasound to further confirm the diagnosis in order to understand the effects of low HCG on the fetus. If you have a low HCG level during pregnancy, you should go to the hospital at any time for checkups, and if you are able to preserve the fetus, then do so under the guidance of the doctor, and usually keep your mood relaxed, and don’t give yourself too much psychological pressure, which will affect the healthy development of the fetus.