The CDC says that pregnant women, who have flu symptoms, should see their doctor as soon as they notice these symptoms. Symptoms include sudden fever, sudden cough, in addition to the other symptoms. These other symptoms could include headache, tiredness, chills aching muscles, limb or joint pain, diarrhoea, upset stomach, sore throat, runny nose, sneezing, and loss of appetite. Pregnant women are moving to the head of the line, for flu vaccine. This is because if pregnant women become infected, they are more likely to suffer severe symptoms. At present, in the US, 266 people have died of this influenza, of thoes there were 15 pregnant women. That accounts for 6% of deaths, but pregnant women make up only 1% of the population.
It has been long known that pregnant women have been at increased risk for seasonal influenza. The vaccine protects not only the mother, but also the baby.