The chorionic villi are usually visible when they fall out of a preeclampsia. Pregnancy tissue mainly includes chorionic villi and meconium, and chorionic villi are an important part of pregnancy tissue and an active part of pregnancy tissue. Pre-eclampsia, if caused by a poor quality embryo, is not successful in preserving the pregnancy, and an inevitable miscarriage occurs After a miscarriage, the villi may fall out and white tissue matter is seen to be discharged. Remove the blood clots from the surface and float it in water to see a white mass that is the villi. If the preeclampsia is caused by low progesterone, and the pregnancy can be successfully preserved through progesterone supplementation, the chorionic villi will not be seen to fall out if the pregnancy can continue. In addition, if you see chorionic villi falling down, you should go to the hospital to determine whether it is a complete miscarriage through ultrasound, and if it is an incomplete miscarriage, you need to clear the uterus.