X-ray is bad in a pregnant women ?

Depends....: Radiation exposure in all patients should be "as low as reasonably achievable" (aka alara). If the clinical question can be ascertained without using x-rays, it should be. If it requires x-rays, then the administered radiation dose should be as low as possible to answer the question.

Yes: X-ray should only be performed while pregnant in an urgent/emergency situation. If it needs to be done, a lead shield should be worn to cover the lower abdomen and pelvis to protect the baby from the radiation.

Direct x-ray: radiation to the pelvis or body parts adjacent to the pelvis could potentially harm the developing fetus, and should be avoided if possible. X-rays of body parts remote from the pelvis(e.g. finger x-ray, mammogram, Head CT) result in no internal or external scatter radiation to the fetus, and therefor will have no effect on the pregnancy.