I had chicken pox when I was a child. These antibodies last a long time and make a person immune to chicken pox. People who are immune most likely will not develop chicken pox if they are exposed again. But you should be sure that you had chicken pox and not some other similar disease. I had chicken pox at 10 weeks of pregnancy.
Most babies born to women who have chicken pox in pregnancy are normal.
However, 1-2 percent of the babies whose mothers had chicken pox in pregnancy have one or more birth defects due to the infection. The virus that causes chicken pox infects the fetus 25 percent of the time. Sometimes, infection of the fetus causes a pattern of birth defects called the varicella embryopathy. Some babies may have only one of these problems while others have some or all. The greatest risk for birth defects is when the mother develops chicken pox between 8 and 20 weeks of pregnancy.