Serena William may be expecting her first child with her fiancé Alexis Ohanian, but the tennis star is refusing to move-in with the Reddit co-founder until she is married.

The 35-year-old opened up about her relationship with Alexis, 34, and her potentially life-threatening pregnancy in a new interview with Vogue, explaining that she feared getting pregnant after she was hospitalized with bilateral pulmonary embolisms following foot surgery in 2011.

Serena, who admitted her pregnancy was unplanned, has to inject herself with anticoagulants daily because carrying a child increases her risk of blood clots.

Image result for serena williams baby bump

Although she was initially terrified of getting pregnant, Serena said she surprised herself when she became ‘really calm’ once she found out that she was expecting.

‘I thought, You have to win, but you’re allowed to lose, because you have something to look forward to,’ she said.

Serena and Alexis are waiting to find out the sex of their child, and while he believes she is carrying a boy, the tennis star is convinced that it is a girl.