Having blood clots without seeing the gestational sac come out may be biochemical pregnancy, incomplete abortion, ectopic pregnancy and other conditions. 1. Biochemical pregnancy: sperm and egg meet to form a fertilized egg and combine, but did not succeed in the uterine cavity and miscarriage, in this case you can detect pregnancy, pregnancy will also have bleeding or blood clots, but will not discharge the gestational sac. 2. Incomplete abortion: when abortion occurs after pregnancy, blood clots will be discharged when the bleeding is relatively large, but the gestational sac remains in the uterine cavity and cannot be discharged, resulting in incomplete abortion, there will be blood clots but the gestational sac is not visible. 3. Ectopic pregnancy: the fertilized egg is not normally deposited in the uterine cavity, deposited in the fallopian tube, abdominal cavity, ovary and other locations, there will be bleeding after the rupture of the pregnancy site, the amount of bleeding is relatively large, will be accompanied by blood clots, but there will not be a gestational sac from the uterus discharged. Women who are sure that they are pregnant and have blood clots and do not see the pregnancy sac, should go to the hospital to find out the cause and then targeted treatment.