Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.

I was told none of the oral contraception was safe enough. I now have the merina coil as it only releases small amount of hormone stays in the uterus and very little gets into the blood stream.
Was a bit sore at first but after things settled is no problem. And best of all very light/zero periods which was essential for me as I was anaemic.
hope this is helpful
Take care
Kate x
http://stoptheclot.org/learn_more/womens_health_faq.htm
http://stoptheclot.org/Newsletters/FINAL_Spring%20Summer%2008%20Nwsl_WEB.pdf
I come off coumadin the middle of next month, and get tested to see if I have any other factors for a PE... I don't have to make my mind up right away, so time will tell.