Lung pain, i have history of DVT/PE...?

Hi I am a 23yr old female. So I have been having lung pain today. In July 2010 I was diagnosed with DVT/PE in my right leg and right lung. I was hospitalized for 6 days. I had to quit taking warfarin a month early do to a 8cm ovarian cyst that had me hospitalized, so I wouldn't bleed internally. I was just wondering if maybe my clots are back again. And what's the chances of them coming back. The doctor was suppose to test me to see if they were caused from the birth control or genetic. But the other day he said he didn't want to test me. I dnt kno what to do and don't want to go to ER if I don't need to