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Hope the below helps
http://www.cdc.gov/ncidod/dvrd/revb/Enterovirus/hfmd-qa.htm#8
What are the risks to pregnant women exposed to children with hand, foot, and mouth disease?
Because enteroviruses, including those that cause HFMD, are very common, pregnant women are frequently exposed to them, especially during summer and fall months. For all adults, including pregnant women, the risk of infection is higher among those who do not have antibodies from earlier exposures to these viruses and for those who are exposed to young children—the primary spreaders of enteroviruses.
Most enterovirus infections during pregnancy cause mild or no illness in the mother. Although the available information is limited, currently there is no clear evidence that maternal enterovirus infection causes adverse outcomes of pregnancy, such as abortion, stillbirth, or congenital defects. However, mothers infected shortly before delivery may pass the virus to the newborn. Babies born to mothers who have symptoms of enteroviral illness around the time of delivery are more likely to be infected. Most newborns infected with an enterovirus have mild illness, but, in rare cases, they may develop an overwhelming infection of many organs, including liver and heart, and die from the infection. The risk of this severe illness in newborns is higher during the first two weeks of life.
Strict adherence to generally recommended good hygiene practices by pregnant women (see the section “Can HFMD be prevented?” below) may help to decrease the risk of infection during pregnancy and around the time of delivery.
http://www.babycenter.com/0_hand-foot-and-mouth-disease_1614.bc
What if I'm pregnant when my child comes down with the illness? Is the baby I'm carrying at risk?
If you're exposed to HFMD when you're pregnant, the chance that your fetus will be affected is very small, but you should mention it to your ob-gyn. Wash your hands frequently after changing diapers or tending to your sick child's needs. You might also want to consider wearing gloves to keep your risk to a minimum
