First, be sure to have your obstetrician confirm that a chlamydia infection is present. If the infection is present, a pregnancy-safe antibiotic will be administered either in the form of a single dose or one that is taken over a week long period. She will then be tested again in about a month to confirm that the infection has cleared.
If no treatment is sought, there is a high chance that the mother will pass chlamydia to her child during child birth as the bacteria is found in the birthing canal. The baby will typically develop conjunctivitis (eye infection) after birth and some contract pneumonia as well. Antibiotics are available for such cases.
As for mom during pregnancy with untreated chlamydia, she has a higher risk of preterm premature rupture of membranes, preterm labor, infections of the amniotic sac and fluids, and low birth weight.
The best course of action is to be treated for this condition promptly.
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More than likely it will not affect the fetus if chlamydia is promptly diagnosed and treated. Chlamydia can sometimes cause preterm labor, premature rupture of the membranes, or low birth weight. Without treatment, chlamydia can be passed to the baby during the birth and (less commonly) before the baby is born. This can cause inflammation and discharge in the baby's eyes (conjunctivitis) or pneumonia.
You should go to the doctor and take antibiotics to cure the infection to minimize the risk for your unborn child. After treatment, pregnant women should be tested again: