Hello ... I M 17 Week Pregnant. One Month Before

Hello ... i m 17 week pregnant. One month before i had painless but heavy vaginal bleeding. Meet my doc that day.it was found in ultrasound that I have a low lying placenta. I monitored for four days in hospital. Iput on saline... my bleeding stops nd I came home. Im in full bedrest . After 3days it again again starts bleeding lightly. Doc says it happens. If it was heavy then I have to admit otherwise take rest at home..from 1month I m continuously bleeding whenever I sit or go to washroom. . Sometimes it becomes more or less.... what to do. .. I m really very afraid of this. Please help me. I m taking Folistar , imax XT , calcium (1tab daily)pregika 200 2times daily nd HCG INJECTION weekly. I had two miscarriages before nd I have a 11 yrs daughter by cesarean . I had no complications during my first pregnancy. I want to know that my baby nd me is safe or not.