Final answer:
The danger of TB during pregnancy that would necessitate a chest x-ray is maternal respiratory compromise.
Step-by-step explanation:
The danger of TB during pregnancy that would necessitate a chest x-ray is maternal respiratory compromise. TB can cause damage to the lungs, and during pregnancy, the immune system is downregulated, making pregnant women more vulnerable to infections. A chest x-ray helps identify any respiratory issues that may arise due to TB during pregnancy.