x-way and pregnancy

  So I'm in the hospital, short breath but what pregnant women ain't ? Lol  I am also having pain and the doctors want me to get an chest X-ray but I already made a mistake in my first trimester and they couldn't find anything . So I just put my baby at risk for cancer in the future or birth defects for no reason.  That was when I was in my first trimester, now I am in my second trimester and I know that it is more safe for the baby in the third  trimester than any other trimester but I am still nervous. I'm afraid because this will be the 2nd time during the same pregnancy. Whould you guys take the doctor advice if you were 6 months ? Or wait for your body to heal on its own ?