The presence of blood clots discharged during the second trimester of pregnancy suggests that there may be a pre-eclampsia, and it is recommended to go to the hospital for progesterone and HCG lab tests. Sometimes when progesterone and HCG drop, there may be bleeding or even blood clots, such as recent overexertion, stress, mental factors, or stimulation of intercourse, which may cause the presence of blood clots, and at this time, treatment to preserve the pregnancy should be carried out. In the second trimester, if there is a certain amount of fluid around the gestational sac, there may also be a preterm miscarriage, and there may also be blood clots or even bleeding, which should be treated with fetal preservation. During the period of fetus preservation, try to rest in bed and do not overexert yourself to avoid increased bleeding, and also keep the bowels open to avoid increased bleeding when straining to defecate.