Activity restrictions vary, from avoiding some forms of exercise to complete bed rest. Restricting activity will not guarantee that a miscarriage will not occur. Providers typically recommend pelvic rest (abstaining from intercourse, douching, tampon use) until symptoms resolve. The woman's condition should be monitored carefully.

The use of progesterone is controversial. The potential benefit is the relaxation of smooth muscle, including the muscles of the uterus. However, this may increase the potential risk of an incomplete abortion or an abnormal pregnancy. It also increases the risk of retaining a hydatidiform mole. In the absence of a luteal phase defect, progesterone supplementation should not be used.

The probable outcome is good when the pregnancy continues to progress and all the symptoms disappear.

• Spontaneous abortion
• Moderate to heavy blood loss
• Anemia
• Dead fetus syndrome
• Infection

It is imperative for a woman who knows she is (or is likely to be) pregnant and who has any signs or symptoms of threatened abortion to contact her prenatal provider immediately.