Over a years time, what are the odds of developing a DVT or PE for a woman who is taking birth control pills? Who's pregnant?

Taking birth control pills: 4 in 10,000 women/year

Pregnant: 6 in 10,000 women/year

This is compared to 2 in 10,000 women/year in those who are healthy, non-smoking, non-pregnant and not taking birth control pills.


Source

Zieman, M. et al. "Patient Information: Hormonal methods of birth control" Up to Date. 20 Nov 2008.