Vomiting and chest pain after pregnancy is usually an early pregnancy reaction, and bleeding in brown color may be ectopic pregnancy, or it may be due to preeclampsia, cervical polyps and other reasons. 1. Ectopic pregnancy: Bleeding brown after pregnancy may be caused by ectopic pregnancy, ectopic pregnancy occurs, can also cause abnormal bleeding in the reproductive tract, at this time the pregnant woman should be vigilant to prevent the occurrence of life-threatening. 2. Pre-eclampsia: Pregnant women can have early pregnancy reaction of vomiting and chest pain, at this time, if due to poor embryonic development, low progesterone and other factors may cause pre-eclampsia, resulting in vaginal bleeding, manifested as brown discharge. 3. Cervical polyps: Bleeding brown after pregnancy may also be caused by cervical lesions such as cervical polyps, cervical cancer, cervical lesions may cause a small amount of bleeding, manifested as brown discharge. Bleeding brown with vomiting and chest pain after pregnancy may also be due to other reasons, and you should consult a doctor to clarify the cause to avoid accidents.