Detecting Pregnancy and Cancer?

A guy found his ex-girlfriend's pregnancy test kit and decided to urinate on it. To his surprise, the results indicated he was pregnant.

Later he received input that he should have a doctor check for testicular cancer. He did and the results were positive. Fortunately, the condition was detected in the early stages.

Notably, the pregnancy test looked for a substance produced by women during pregnancy. The substance, however, is also produced by men with testicular cancer.

Heh.