Several studies have suggested that: 1) the risk of spontaneous abortion in the first pregnancy is 12%; 2) after one spontaneous abortion, the risk of spontaneous abortion in the next pregnancy is about 24%; 3) after two spontaneous abortions, the risk of spontaneous abortion in the next pregnancy is about 26%; 4) after three or more consecutive abortions, the risk of spontaneous abortion in the next pregnancy is 32-45%. 5. If a woman has a history of previous normal births, the spontaneous abortion rate for her next pregnancy is only 4-6%. If a woman has a history of previous spontaneous abortions, her next pregnancy has a miscarriage rate of 19-24%. Researchers generally agree that the greater the number of miscarriages, the higher the recurrence rate.