I am 33 yes old. I had complete placenta previa in my last pregnancy they did histrotomy at 25th week. This time the placenta is posterior but the gyne said there is poor blood supply to the placenta. So she suggest me to take injection to thin blood is it safe if I am taking aspirin daily. I am also using miprogen vaginally. Could you pls suggest me is it safe after 20 weeks. Pls answer.