Why it happens

There are many different reasons for pregnancy loss. Ask your healthcare provider about these possible reasons:

• Genetic problems. Problems with the genes or chromosomes of the baby are the most common reason for a first pregnancy loss. This often happens all of a sudden, by chance, in the embryo. This is usually less often the cause for women with repeated pregnancy loss.

• Problems with the uterus. Problems with the uterus can cause both first and second trimester pregnancy losses. Problems you are born with (congenital) include double uterus or uterine septum. Other problems are uterine polyps, fibroids, and scar tissue inside the uterine cavity.

• Cervical insufficiency. This is sometimes called incompetent cervix. If you have cervical insufficiency, you will lose the pregnancy around 20 weeks. This problem can be treated with a stitch to help hold the cervix closed or progesterone supplementation.

• Being exposed to certain chemicals. If you or your partner is exposed to certain chemicals, it could cause pregnancy loss. Some chemicals that may be linked to it include: anesthetic gases (nitrous oxide), pesticides, formaldehyde, benzene, ethylene oxide, arsenic, lead, mercury, and cadmium. You and your partner should talk with your healthcare provider about any chemicals in the workplace.

• Endocrine problems. Some endocrine problems have been linked to pregnancy loss. These include diabetes (that is not controlled), severe thyroid problems, or luteal phase defect.

• Smoking, drinking, and drug use. Smoking, drinking, and illegal drug use can cause repeated pregnancy loss. You should not smoke. You should also stay away from alcohol and drugs during pregnancy.

• Immune problem. An immune problem called antiphospholipid syndrome causes repeated pregnancy loss in some women. This problem can be treated with low-dose aspirin and heparin.

Testing and treatment usually aren't done until after the third miscarriage in a row. However, they can be done after a second miscarriage if you are age 35 or older. A lot of the testing and treatment are controversial. Also, the reasons that treatments work are not well understood.

Getting pregnant again

It is likely that you will go on to have a healthy baby even if you’ve suffered repeated pregnancy loss. Informative and caring counseling seem to play a big role.

These things can raise your chance of having a healthy and successful pregnancy:

• Having a healthy lifestyle

• Taking a folic acid supplement

• Quitting smoking

• Controlling your weight

• Not drinking alcohol

• Reducing the amount of caffeine in your diet