At the clinic, the doctor explained the importance of follow-up testing and offered to arrange appropriate medical evaluations.

Mark sat with his arms folded.

“I know how these things work,” he said. “I had the procedure. She got pregnant. Somebody cheated.”

The doctor remained calm.

“Your procedure doesn’t establish paternity, and pregnancy after vasectomy, while uncommon, is possible. If you want to determine biological parentage, a properly arranged paternity test is the appropriate way to do that.”