Generally speaking, the residual fetal membranes under 2cm may be expelled by themselves, but it is not absolute, depending on the individual situation.
After miscarriage or delivery through ultrasound examination of fetal membrane residue, the amount of fetal membrane residue is relatively small, under 2cm, the fetal membrane may be expelled on its own, then you can take drugs to promote uterine contraction under the guidance of the doctor, such as motherwort granules, new biochemical granules, or injections of uterine contraction, to help the intrauterine placenta residue discharged out of the body.
If the amount of retained fetal membranes is large, more than 2cm, it is more difficult to be discharged on its own, and it is recommended to remove the fetal membranes by purging surgery, so as not to lead to prolonged bleeding which may cause infection.
After the residual fetal membrane is recommended to go to the hospital for examination, so that the doctor according to the individual situation of the correct treatment, the above drugs need to be used in accordance with the doctor’s instructions, after the operation, pay attention to rest, do not exercise strenuously, do not have sex too early.