Seven weeks of pregnancy outflow of blood clots may be caused by spontaneous abortion, ectopic pregnancy, staphylococcus and so on. 1. spontaneous abortion: seven weeks of pregnancy due to poor embryo quality, insufficient hormone secretion, chromosomal abnormalities and other reasons triggering spontaneous abortion of the fetus, fetal membranes from the uterus will cause vaginal bleeding, bleeding is relatively large may form blood clots. If it is inevitable abortion to observe whether the pregnancy is completely discharged, there are some residual may have to clear the uterus treatment. 2. Ectopic pregnancy: After pregnancy, the gestational sac does not normally settle in the uterine cavity, but in the fallopian tube, ovary, uterine horn and other locations, there may be vaginal bleeding and the formation of blood clots. Diagnosis will be confirmed through ultrasound and puncture of the posterior vaginal fornix, and then methotrexate conservative treatment or surgical treatment will be chosen according to the situation. 3. Staphylococcus: seven weeks pregnant is staphylococcus, staphylococcus tissue from the meconium peeling, so that the maternal blood vessel rupture triggered by vaginal bleeding, but also the formation of blood clots, once diagnosed to be timely removal of the uterus treatment. Seven weeks of pregnancy outflow blood clots more causes, to go to the hospital through the examination to determine, and then targeted treatment.