The appearance of pink discharge in early pregnancy may be caused by fertilized egg implantation, preeclampsia, ectopic pregnancy, biochemical pregnancy and other reasons. 1. Fertilized egg implantation: In early pregnancy, the implantation of the fertilized egg may cause bleeding from the uterine lining, which leads to the appearance of a small amount of brown or pink discharge. 2. Pre-eclampsia: If a pregnant woman experiences uterine contractions under the influence of low progesterone or various adverse factors, the embryo may detach from the uterine lining, resulting in vaginal bleeding. 3. Ectopic pregnancy: If the fertilized egg is deposited in a place other than the endometrium, as the embryo grows up, it will lead to local tissue rupture and bleeding, which will be manifested as vaginal bleeding. 4. Biochemical pregnancy: pregnant women in the early stages of pregnancy pink discharge, but also may be due to the fertilized egg did not bed in the lining of the uterus, completely discharged from the body and caused by biochemical pregnancy. Pregnant women who experience abdominal pain or abnormal vaginal bleeding in early pregnancy must seek medical attention as soon as possible.