Bleeding like menstruation on the 50th day of pregnancy may be caused by pre-eclampsia, ectopic pregnancy or embryonic arrest. 1. Pre-eclampsia: The endometrial lining of the uterus sheds spontaneously under the influence of hormone levels, resulting in bleeding like menstruation, which may be pre-eclampsia, you should go to the hospital for ultrasound to check whether the embryo is developing normally, and then follow the doctor’s instructions, take birth control medicine. 2. Ectopic pregnancy: Ectopic pregnancy rupture bleeding, usually accompanied by lower abdominal pain, nausea and vomiting and other symptoms. This situation needs to go to the hospital immediately for surgical treatment. 3. Embryonic arrest: When the embryo stops developing, the embryonic tissue peels off the uterine lining, which can lead to symptoms such as small amount of vaginal bleeding and abdominal pain. It is recommended that if bleeding occurs on the 50th day of pregnancy, go to the hospital for examination in time to clarify the cause of bleeding and carry out standardized treatment under the guidance of the doctor.