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Threatened abortion is vaginal bleeding and symptoms that suggest that a woman is at an increased risk of miscarriage. It happens during the first 3 months (or 20 weeks) of pregnancy. While some women will have bleeding in early pregnancy, a woman may or may not miscarry.
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Early-pregnancy bleeding can come from the uterus, cervix, vagina, or the external genital area. Bleeding is often due to a minor condition. Possible causes of bleeding include:
Things that may increase the risk of threatened abortion include:
The main symptom is bleeding during the first 20 weeks of pregnancy. Bleeding may be light or heavy. Cramping may also be present.
Vaginal bleeding during pregnancy, especially with belly pain, should always be reported to a doctor.
The doctor will ask about your symptoms and past health. A physical exam will be done. Tests may be done to look for a cause. Tests, if needed, may include:
Many cases of threatened abortion require no treatment at all. Treatment, if needed, may include:
It is not always possible to prevent threatened abortion. Proper prenatal care may help to find and treat problems early.
American Congress of Obstetricians and Gynecologists
American Pregnancy Association
Canadian Association of Pregnancy Support Services
Bleeding during pregnancy. American Pregnancy Association website. Available at: http://americanpregnancy.org/pregnancy-complications/bleeding-during-pregnancy. Updated August 2015. Accessed March 19, 2020.
Bleeding during pregnancy. The American Congress of Obstetricians and Gynecologists website. Available at: http://www.acog.org/~/media/For%20Patients/faq038.pdf?dmc=1&ts=20120814T1300076311. Updated July 2016. Accessed March 19, 2020.
Deutchman M, Tubay AT, Turok D. First trimester bleeding. Am Fam Physician. 2009 Jun 1;79(11):985-94
Last reviewed September 2019 by EBSCO Medical Review Board Mary-Beth Seymour, RN Last Updated: 7/17/2020