I have to agree with you L-BSE, I think that [if she IS 'really' pregnant] it's her English teachers. There was just that look in her eye, which althought can reasonably be interpreted for something else, I just have a gut feeling that Sun lied to Jin and she did sleep with 'Jae' [thanks for the namecheck Mantis
]
Thats an interesting point posed by Mantis though - where did the pregnacy kit come from? I assumed it was from the plane because I doubt that Sawyer managed to nick much stuff from the hatch..although..in saying that, he DID nick the medicine from the hatch didnt he! because Jack stole it from him and then he stole it back..and then Jack took it back again! lol. So, indeed, what was a pregnancy kit doing in the hatch? Were there women down there? Was it not just a 2 'man' job but a two person job at one point? Hmmm.....interesting!
Also, if it was from the hatch then was it made by Dharma or another company..[like the bars Apollo were]?
Oh..and my other possible theory on Suns pregnancy is that [much like my thoughts on Claire and Susan
] she was experiemented on..maybe part of The Hanso foundations wider experiment?