Which Position?

A blonde, a brunette, and a redhead all go to an obstetrician to find out the gender of their babies. The doctor asks the brunette what position she was in and she says I was on top and he says, “Oh, well then you’re gonna have a boy.” The redhead replies, “I was on the bottom” and the doctor says, “Well, then you’re gonna have a girl.” The blonde starts crying and says, “Oh my God, I’m gonna have a puppy.”