Pre-natal Checkups

There were three women who were at the gynecologist having pre-natal checkups. The doctor asked the first woman:

"In what position was the baby conceived?"

"He was on top," she replied.

"You will have a boy!" the doctor exclaimed.

The second woman was asked the same question.

"I was on top," was the reply.

"You will have a baby girl." said the doctor.

With this, the third women, a blonde, burst into tears. "What's the matter?" asked the doc.

"Am I going to have puppies?"