Well PE starts as a blood clot in your legs. Chances are if you had once in your legs, you would have had profound swelling of the ankles, and pain inside of your legs to the point where you couldn't help but notice it. If you didn't have that, you probably don't have PE. I would see your doctor though, to rule out asthma or perhaps a respiratory infection.
Don't worry, you don't have PE. If you did you wouldn't be sitting here talking to us right now.