I don't wish to moralise here, but I think that there is an element to this story that simply cannot pass without comment.
"The Year 11 pupil is not thought to have known she was pregnant. "
It is true that I am male and, as such, have not had first-hand experience with preganacy. However, all reports seem to indicate that it is a fairly obvious 9-month process. At some point there, one expects the bearer to become aware of the growing child.
Or perhaps I am mistaken.