The doubling of HCG in pregnant women is not necessarily related to bed rest. HCG is human chorionic gonadotropin, and its rapid doubling is related to embryonic development, multiple pregnancy, or possibly gravidity, not related to bed rest. 1. embryonic development: in the early stage of pregnancy, starting from the completion of fertilization of the egg, the HCG value in the body increases at the rate of doubling every other day, and the general hcg increases to 10,000 When the hcg increases to more than 10,000, the growth rate will slow down and start to decline gradually around 12 weeks; 2. Multiple pregnancy: the HCG doubles quickly may appear in multiple pregnancies, the most common is twins, and because of the large amount of chorionic villi in multiple pregnancies, the hcg will be higher than in singleton pregnancies. Multiple pregnancies have an increased incidence of complications compared to singleton pregnancies, so you need to go to the hospital regularly for pregnancy tests, deal with any abnormalities in a timely manner, and pay attention to supplemental nutrition in your diet; 3. Gravidity: a common factor that causes a rapid doubling of HCG. Staphylococcal fetus not only leads to rapid doubling of HCG, but also may cause abdominal pain and abnormal enlargement of the uterus, hyperthyroidism, vaginal bleeding and other symptoms. You need to go to the hospital for relevant examination in time. If it is confirmed to be a gravida, you need to undergo a cervical operation and after that, check the hcg drop regularly until it will come to normal. Therefore, bed rest does not affect the doubling of HCG. For the health of pregnant women, they can do proper exercise during pregnancy to enhance their physical fitness, but avoid straining.