It certainly wouldnt be something you come up against.
Could it be something in the air?
Or something like a machine?
Like from a Dharma station?

I just think it's too coincidental that pregnancies are terminated, ALONG with the mother, at a certain time during the pregnancy and it seems to be around the time of an early birth for Ben. Ben has a tumor wrapped around his spine like Jacob has a black circle of ash around his 'area'. This seems to be a Herculian struggle between a powerful psychic and a well read, well prepared con man with, perhaps, some psychic abilities himself.

SO you are saying Ben did it?