If you get infected while pregnant, the virus can cause an illness called fifth disease. This is transmitted via droplets. Common symptoms include fever, respiratory problems and rash. Some women also experience joint pain. More than half of pregnant women are immune since they had the infection as a child. The virus can pass to the baby in your womb, but the risk is slim. Diagnosis is made through the clinical history and blood tests. If you are infected with the virus, you will be monitored carefully and frequently. The infection can pass to the baby in your uterus and cause anemia.
Source: - https://www.cdc.gov/parvovirusb19/