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 mean, you could go to the ER, spend the time and money, but nothing would change in the long run in terms of your treatment or recovery.
I do understand just wanting to *know*. I turned down a leg ultrasound after my PEs, since it wouldn't change anything, but even now I wonder if I did have additional clotting there (although it would have been asymptomatic). Even so, though, I still have to remind myself that it wouldn't change anything.
At this point, I think you just have to weigh your need to "know" against the time and money you'll spending finding out. You're not in any danger by NOT knowing, since a clot there is still being treated. It just depends on what you feel is critical for you personally.
I used to be really confident about my body, and I hope I can be again. It's been really hard for me to judge. I used to avoid drs and hospitals like the plague. I hate feeling scared like this.
I think most of us wind up doing at least a few repeat trips to the ER. I did two, myself, one of them via ambulance. Both times, it wound up being anxiety. We've all been there!
I hate it.