I've also heard that Ron and Hermione are going to have a kid! Why'll they're still in Hogwarts That's still not as shocking as the rumor of this happening with her and Malfoy These rumors also involve*Gulp* MARRIGE!
Maybe if it has some sort of epilouge, and it briefly speaks about the life of the characters in the future. And if they do like each other (as it seems to be) and if they do deafet Voldemort (this might happen at the end of the book), there is a high probability they will get married and have children. It's just how life goes...
I think there is enough contraversy in the books as it is, and teenaged pregnancy would just be too much. It seems to me that they are just not that... what's the word.... 'hormonal' about their affections for each other?