Three pregnant women are waiting in a doctor's office.

The first one says, "I know we're having a girl because I was on top when we conceived."

The second woman said, "Well, I know we're having a boy because he was on top when we conceived."

The third woman burst into tears.

"What's wrong?!" the other two asked.

She sniffed and said, "Oh my god! I'm having a puppy!"