Why am I experiencing painful labia majora symptoms?

It sounds like you want to know about abortion. I would suggest you make an appointment with a gynecological who could suggest a safe and legal method of termination if you and your wife conclude that to be the most suitable route in your particular situation.

Plan B is most effective when used as soon as possible after unprotected sex — preferably within 72 hours. It prevents pregnancy by postponing ovulation. However, it is essential to remember that it is not 100% effective. If you miss your period or notice any unusual symptoms, make sure to take a pregnancy test. 

No, looking pregnant is not normal after ablation. Seek evaluation

Radiation is neither dangerous nor harmful to an unborn baby when the mother's stomach is well covered during pregnancy and X-rays are taken. The child was probably well protected by the lead plate covered by the pelvic region during the X-ray. In general, radiation obtained from a single X-ray is so low that it cannot make an early pregnancy harmful. Nevertheless, telling the doctor about the X-ray and pregnancy is always the best choice. They might wish to examine the pregnancy more often to make sure that it is developing properly. 

In case you have pain or discomfort in your vagina, an immediate visit to the gynecologist is recommended. This might indicate an infection, wound, or some other medical condition.

Yes the pain and burning sensation is due to irritation from the soap. Soap can sometimes cause irritation and disrupt the natural balance of the sensitive skin in that area. If this happens just rinse the area thoroughly with clean water and avoid using any harsh soaps, fragrances, or other irritants in that area. 

If you continue to experience symptoms such as missed periods or abdominal pain, even after a negative pregnancy test, it is important to consult a gynecologist for further evaluation.