England's chief medical adviser Professor Chris Whitty warned: 'Infections and pregnancy are not a good combination in general.'
The mum-to-be attended the Six Nations game with fiancé Boris Johnson.
She attended a reception at Downing Street for International Women’s Day.
The outfit she wore to meet the Queen set her back £225 - rather than £2,100.
The dress has been slashed to £95.
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The UK's 'First Girlfriend' opted for yet another affordable midi dress.