The placenta may grow upwards at 20 weeks of pregnancy. The placenta usually begins to grow at 12 weeks of pregnancy, and by mid-pregnancy, the area of the placenta is relatively large in relation to the area of the uterine cavity, and the placenta is likely to be attached to the endocervical os or closer to the cervical os. Before 28 weeks of pregnancy, the placenta will also slowly move upward as the fetus grows, gradually moving away from the cervical opening, so the placenta at 20 weeks of pregnancy may also lift upward. The low position of the placenta occurs at 20 weeks of pregnancy, and if it is accompanied by vaginal bleeding, you need to do less activity and try to rest in bed. If the bleeding is heavy, hospitalization is needed to avoid miscarriage or inability to continue the pregnancy.