"Fine," thought Jon. "There's nothing here that's useful. Sheesh, all that there is I can use is myself." He dwelled on that thought a bit too long, and ended up impregnating himself. He wasn't aware of what he had done, though, at least until the morning when he woke up feeling sick. Jon realized he was on his back--and his stomach was weighing him down and bulging.
I really messed up this time, thought Jon. It must have been about a month of rapid maturity per hour. He gritted his teeth and got out of bed. The weight made it hard to walk but the stone was only a few feet away. He picked it up and said "I wish I know if this pregnancy is safe."
It was safe. Anything human-shaped that became pregnant would give birth the normal way even if it had to develop a vagina for an hour in order to do so. But safe or not, he hadn't planned on being like this.
