If you find brown vaginal discharge when you are 33 days pregnant, you should be alert to the following problems clinically: 1. To exclude the possibility of ectopic pregnancy, some people often have irregular vaginal bleeding after menopause in ectopic pregnancy, it is recommended that you can draw blood to monitor the blood HCG and check it every other day. If the blood HCG value does not double every other day, it is likely to be an ectopic pregnancy, and it is best to be hospitalized for observation. 2. Due to progesterone insufficiency, which clinically creates the possibility of preeclampsia, it is best to take bed rest if the blood HCG can double after laboratory tests. And it is recommended to do ultrasound examination every two days to find out whether there is a gestational sac in the uterus, and then give appropriate treatment.