You said you took a pregancy test before you got the x-ray, but just had not seenvthe results yet at the time.
Have you seen the results now? If they didnt call you tell you if you were pregnant or not, you can call them. Then at lease you wouldnt have to upset yourself worrying if you were never pregnant in the first place.
Had you experienced any pregnancy symptoms before taking the test, or did you just take it as a precaution before an x ray since you are sexually active?
Maybe you just got unlucky with a period from hell due to the stress
what is the point? at least this way i dont know. its better than knowing