Question
A pregnant woman at 13 weeks discovered marginal placental bleeding at home and underwent bed rest and traditional Chinese medicine for pregnancy preservation. The fetus’s growth and development were normal, but she was hospitalized for bed rest due to marginal placental bleeding at 17 weeks. However, during the hospital stay, the placenta and fetus were naturally expelled. The woman wants to ask about whether the effectiveness of intravenous pregnancy preservation diminishes over time, and if there is a possibility of needing a dilation and curettage procedure.