Mother Who Thought She Had Stomach Pains Gives Birth, Husband Was Told He Was Sterile
An Iowa couple is shocked to be new parents after the husband was told he was sterile and the wife had no idea she was pregnant at the time she went to the hospital complaining of stomach pains. Ref. Source 9
There is no guarantee in a vasectomy and he said it does happen from time to time. He said right after the operation it is more apt to occur (Rarely) but has seen it happen up to 10 years later (Extremely rare). The doctor I used will not do on open vasectomy as they are more prone to this happening.
There is no guarantee in the operation but I guess they could do something wrong as a patient you likely would never be told if they did. At least there is no cost for this operation in Ontario.