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Miscarriage refers to the premature end of a pregnancy before the developing baby is able to survive outside the womb. Miscarriage can occur during the first or second trimester, before 20 weeks. Most occur in the first 12 weeks of pregnancy. They often are unexpected and isolated events. About 15%-20% of recognized pregnancies end this way.

Fetus in First Trimester

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Miscarriages often occur for the following reasons:

• Chromosomal abnormalities (common cause)
• Abnormalities in the uterine tract (eg, fibroids)
• Hormonal problems (eg, not having enough progesterone, a female hormone needed to support pregnancy)
• Factors related to the immune system (eg, may cause blood-clotting problems or rejection of the fetus)
• Trauma

In some cases, the cause is unknown.

Factors that may increase the risk of miscarriage include:

• Having an infection
• Being older (maternal age of 35 years or older)
• Smoking, drinking alcohol, or using drugs
• Taking certain prescribed medicines
• Being exposed to certain environmental toxins
• Having a long-term condition that affects the immune system (eg, lupus, diabetes)
• Having high-dose radiation therapy on the ovary and uterus or the pituitary gland during treatment for childhood cancer

Having a miscarriage during your first pregnancy may place you at a higher risk for complications during your next pregnancy. These complications may include:

• Pre-eclampsia
• Threatened miscarriage
• Induced labor
• Preterm delivery
• Low birth weight
• Postpartum hemorrhage

Symptoms include some or all of the following:

• Vaginal bleeding
• Pink or brown discharge
• Cramping
• Passing the fetus, placenta, and surrounding membranes through the vagina
• Fever

You will be asked about your symptoms, the length of your pregnancy, and when you first noticed a change in your condition. The doctor will perform physical and pelvic exams.

Prior to miscarriage, tests may include:

• Ultrasound testing—to assess the health of the fetus or detect an ectopic pregnancy (a pregnancy in which development occurs outside the uterus)
• Blood test—to check the exact amount of the hormone (called human chorionic gonadotropin or hCG) important to sustain an early pregnancy

After miscarriage, tests may include:

• Examination of the tissue that has passed through the vagina
• Blood tests—to check for a chromosomal error in the man or the woman or to check hormone and antibody levels
• Imaging tests—(eg, x-rays, ultrasound) to identify a problem with your uterus
• Endometrial biopsy—to check the uterine lining to see if it can support a pregnancy
• Hysteroscopy—to examine the inside of the uterus

Immediate care usually involves observation only, especially in early or first trimester miscarriages. Medicine may be indicated in the event of heavy bleeding or cramping. A dilation and evacuation (D&E) may be needed if uterine contents are not spontaneously expelled (passed through the vagina). During a D&E, the doctor dilates the cervix, inserts a tool into the uterus, and suctions out remaining material.

Before you start to plan your next pregnancy consider the following regarding your health:

• Is your diet ready to support another pregnancy?
• Are there habits you should change prior to another pregnancy?
• What medicines are you taking and will they affect a pregnancy?
• How is your health?
• Are there issues you should resolve before trying another pregnancy?