Jon figured out that the simplest thing to do would be to make someone pregnant. A person.
On the other hand, Jon didn't think most people would be very happy if asked if they want to have Jon's baby. It's a very strange request, and even if someone believed it, who would want to do it? At least you don't have to worry about whether inanimate objects would let you do it. Jon considered using one of the silly inanimate objects in his room anyway, thus creating a child who was half dirty sock, but then decided to use the stone. That's what it was for anyway, right?
"I wish that someone who'll want me to make them pregnant using this ring would come here and I'll be able to do it."
