I was just going from the info stated in the information and spoilers posted by the administraor for this web site about the possibility of a third father. If you go to "D.O.C." discussion list and go to the forum that says "episode information & spoilers" it in the spoiler box..well you go read it yourself I don't want to post anything that gives anything away.

This is a little of a tangent, but it does have to do with Sun's pregnancy. Juliet told Sun that on-island males' sperm counts were 5 to 6 times higher, but that is presumably for normally fertile off-island males. Since Jin was infertile before coming to the island, maybe his count is simply normal on the island, and somehow that will make a difference in Sun's ablility to carry the baby to term.

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`Dear, dear! How queer everything is to-day! And yesterday things went on just as usual. I wonder if I've been changed in the night? Let me think: was I the same when I got up this morning? I almost think I can remember feeling a little different. But if I'm not the same, the next question is, Who in the world am I? Ah, that's the great puzzle!'

-- Alice, from “Alice’s Adventure’s in Wonderland”

that's interesting, I wonder if the others have already done studies including men with low sperm counts. The increase itself (sperm count) would lead me to believe that they might have already been down that road in research.

That's how I interpreted it, exactly.