Re: what can hurt your unborn baby
I don't think that one x-ray will do any damage, but avoid them next time or inform your dentist if you go again during your pregnancy.
Secondly, you should avoid the basics...alchohal, smoking, drugs. If you are taking vitamins or suppliments, stop and wait until you speak to your doctor so you know if you can continue or to take less. Though you should be starting on prenatals. Avoid too much fish, my doctor told me I could have fish twice a week but no more. Don't consume anything raw like meat or fish as well and make sure all your raw veggies and fruits are washed as well.
Also if you are on medication for anything you can call your doctor or the pharmacy to make sure what your taking is safe for the baby, you shouldn't wait until a doctor's visit to clarify this since the medication can possibly harm the baby but you also don't want to hurt yourself if you stop taking it. So if you are on any meds as of now call your doctor immediately to confirm them.
I can't really think of anything else as of now, most things are common sense, that is if they can harm you they can harm the baby.
The best thing is to not stress to much, the baby can feel your emotional and physical stress; so calm down and don't panic. When you do go to your doctors meantion the x-ray; but like I said before I'm sure that one won't do harm to your unborn. Good luck