Chickenpox and Pregnancy. Pregnant woman has had chickenpox before the pregnancy

Chickenpox and Pregnancy
Pregnant women and anyone with immune system problems should not be near a person with chickenpox. If a pregnant woman who hasn't had chickenpox in the past contracts it (especially in the first 20 weeks of pregnancy), the fetus is at risk for birth defects and she is at risk for more health complications than if she'd been infected when she wasn't pregnant. If she develops chickenpox just before or after the child is born, the newborn is at risk for serious health complications. There is no risk to the developing baby if the woman develops shingles during the pregnancy.
If a pregnant woman has had chickenpox before the pregnancy, the baby will be protected from infection for the first few months of life, since the mother's immunity gets passed on to the baby through the placenta and breast milk.
Those at risk for severe disease or serious complications — such as newborns whose mothers had chickenpox at the time of delivery, patients with leukemia or immune deficiencies, and kids receiving drugs that suppress the immune system — may be given varicella zoster immune globulin after exposure to chickenpox to reduce its severity.