It's "good" that you have bronchitis right now for 2 reasons.
One being, this could very well be what this spot is related to. It's very easy to misread an x-ray of the lung, not because doctor's are too dumb to read them but more because it's a rudimentary tool nowadays with MRI's, CT scans and the like and moreso because the incidents of false positives on lung x-rays is pretty high.
Second being, that you'll get to find out what this is if it is something. It's alway's better to catch any kind of thing early. I know it's hard not to worry so I won't even tell you not to. If you smoke, quit now. This may just be the incentive you need. If you don't smoke that's even more good news because lung cancer is pretty rare in someone who doesn't smoke.
Good luck.