Found this for you.. looks like there's very little chance of harm but it will mean the doctor will monitor you more closely through pregnancy to be safe.
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Fifth Disease in Pregnant Women
Generally, most pregnant women experience no serious complications if they are exposed to the parvovirus B19. In fact, about half of all women are already immune to the virus (although they may not know it) due to a previous exposure. Those women who do get sick usually experience only mild symptoms with no ill effects on their baby.
For some women, though, parvovirus B19 can lead to severe anemia in the baby and may even cause a miscarriage. The risk of this happening is higher for those women in the early stages of pregnancy. However, this occurs in less than 5% of pregnant women who have been exposed to fifths disease. There is no evidence to support the idea that the virus can lead to birth defects or mental ******ation in a child.
I’ve Been Exposed, Now What?
If you suspect or know you’ve been exposed to the virus, contact your health care provider. She can perform a blood test to see whether or not the parvovirus is present in your blood system. If the virus is present, your health care provider may decide to monitor you more closely.
There is no vaccine or preventive medicine available for fifth disease. In fact, there is very little you can do to avoid being infected with the virus other than washing your hands frequently. Since people are contagious before they develop the characteristic rash of fifth disease, it is difficult to evade exposure. However, if you know that there is an outbreak in your work place, you may choose to steer clear until the outbreak has died down. This is entirely a personal choice, though.