While excessive stress isn't good for your overall health, there's no evidence that stress results in miscarriage.
About 10 to 20 percent of known pregnancies end in miscarriage. But the actual number is likely higher because many miscarriages occur before the pregnancy is recognized. Most often, early miscarriage is caused by a chromosomal abnormality that interferes with the normal development of the embryo.
Often, there's nothing you can do to prevent a miscarriage. However, managing any chronic conditions you have, such as diabetes or high blood pressure, and avoiding risky behaviors, such as smoking and using illegal drugs, can decrease your risk of a miscarriage.
If you're experiencing a high amount of stress, talk to your health care provider about management techniques.