The most common cause of bleeding on the 50th day of pregnancy is preterm miscarriage, and there is another condition where bleeding can occur in ectopic pregnancy, which needs to be distinguished. First of all, an ultrasound should be done to determine whether it is an intrauterine or ectopic pregnancy. If it is an early ectopic pregnancy, you can take conservative treatment by taking the drugs mifepristone and misoprostol to avoid serious development of the condition. If the condition progresses faster, with obvious stomach pain and increased bleeding, surgery should be taken in time, otherwise it may be life-threatening.