MMR vaccines are usually contraindicated in pregnant women because they are live attenuated vaccines, although this is a purely precautionary measure. Inadvertent administration of MMR vaccines is not considered an indication for termination of the pregnancy, as there is no evidence of harm to the fetus.
I received the MMR vaccine before I knew I was pregnant. Will the vaccine increase the chance of birth defects?
There is no evidence that getting the MMR vaccine before or during pregnancy would increase the chance of birth defects. The MMR vaccine is not recommended during pregnancy because of a very small chance of developing the virus from the vaccine itself. This is very rare, and is more likely to happen in people who have problems with their immune systems. Due to this very small chance of illness, the Centers for Disease Control and Prevention (CDC) recommend waiting 28 days after getting the MMR vaccine before trying to get pregnant. However, there is information from a large number of pregnancies where women received the MMR vaccine after they were pregnant. They did not have pregnancy complications and there was no increased rate of birth defects.
There is no evidence that getting the MMR vaccine before or during pregnancy, or while breastfeeding, would increase the chance of autism in a child. There is also no evidence that young children who get the MMR vaccine at the recommended ages would have an increased chance of autism.
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