The woman had an operation when she was younger to fix the problem, but it didn't go according to plan and left a tiny hole connecting her womb to the rectum.
After the surgical disaster, she gave up hope of ever getting pregnant but was left shocked after she found out she was pregnant and admitted her anal escapades to Dr Steixner. She got pregnant because of the hole connecting her womb to her rectum after the surgery.
Dr. Steixner performed X-rays on his patient which confirmed she had gotten pregnant through anal sex. He said:
"We knew about her condition, and we had followed her for a decade. "After doing a whole bunch of X-rays, we determined that she got pregnant from having anal sex."
Source: UK Mirror