PlayHealth officials have played down fears over the impact of swine flu on pregnant women.
The Department of Health posted a new document on its website saying: "While most pregnant women with swine flu will only have mild symptoms like most other people, there is a higher risk of developing complications. If you are pregnant and think you may have swine flu, call your GP."
Pregnant women may be given antiviral drugs, which can be taken while breastfeeding, according to the website.
Concerns were heightened after a woman with swine flu died last week shortly after giving birth prematurely. The total number of deaths linked to swine flu now stands at 29 in the UK.
The Government will face a dilemma when it comes to deciding who will be vaccinated when doses become available later this year amid conflicting advice on inoculating mothers-to-be.
Public health minister Gillian Merron said: "Pregnant women are in the groups that we are looking to make the highest priority." But vaccinations are not usually recommended in pregnancy, according to the Royal College of Midwives.
Home Secretary Alan Johnson - who was Health Secretary during the early stages of the swine flu outbreak - said that Britain was well-prepared because the Government had placed the danger of novel pandemics above even terrorism as the main threat to the UK.
But he acknowledged that the H1N1 virus was developing in a different way to what had been expected.
Mr Johnson said that suggestions that would-be mothers should put off pregnancy until the pandemic has passed were "an over-reaction" and said he believed most parents would follow "common-sense" precautions.
His comments came as economists warned swine flu could cause the UK's ailing economy to contract by 7.5 per cent this year and write-off hopes of a recovery in 2010.
Earlier, advice for holidaymakers was released, warning Britons not to travel if they have swine flu. As schools break up, the Department of Health advised people with the virus to delay journeys until symptoms had gone.
Officials warned that visitors to a number of countries would have to face strict screening procedures. In China, 52 British schoolchildren and teachers were placed in quarantine in a Beijing hotel after eight teenagers were diagnosed with swine flu.
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