Can Pregnancy Sex Cause a Miscarriage?

Expert advice on whether having uterine contractions during orgasm has the potential to cause a miscarriage.

Q. My husband and I are still enjoying an active sex life now that I'm pregnant, but I'm afraid to have orgasms because of the way they make my uterus contract. Can this lead to miscarriage?

A. Not usually. Enjoying sex while you're pregnant is a safe and healthy thing to do, says Elizabeth Stewart, MD, a professor of obstetrics and gynecology at Harvard Medical School. The only exceptions are if you've had a threat of miscarriage, a prior preterm birth, if your cervix is incompetent or dilated, or if you're experiencing unexplained vaginal bleeding or discharge. In those situations, certainly discuss your concerns with your doctor.

All women experience uterine contractions during orgasm. They're caused by prostaglandins, substances found in semen and some bodily tissues, explains Dr. Stewart. You just feel these contractions more intensely now because your uterus is swollen and your blood flow is increased. But in a normal pregnancy these contractions won't cause you to lose the baby. Your unborn child is well padded against any sexual acrobatics by the fluid-filled amniotic sac and strong uterine muscles, and he's guarded from infection by a thick mucus plug that seals the cervix.

Holly Robinson is a writer who lives with her husband and their five children north of Boston.

Originally published in American Baby magazine, September 2004.

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