Spoilers of course
Assuming you saw up to the 30 minute point...
Ana Lucia goes to Sayid and Charlie with the map that Henry Gale has drawn her to his balloon. She didn't tell Locke or Jack because they are clearly in a power struggle. They set off to find it to determine if Henry is telling the truth.
Sun takes the pregnancy test with Kate at her side, and it is positive. They go to Jack to determine its accuracy and he says they are pretty accurate.
Flashback to the hotel room...
Sun is telling her friend that she is planning to leave Jin and go to America. He tells her not to be hasty and run away from her life. She says, "Should I stay for Jin?" to which he replies, in English, "I'm not saying you should stay for Jin." They are really close and seem to be "sharing a moment."
Camped out for the evening on their journey, Ana Lucia and Sayid are both awake and talking. She finally apologizes to him about the Shannon incident, and he tells her it's not her fault, it's the fault of the Others and Ana was only protecting her people. He goes on to say that once he determines Henry is one of the Others, there will be hell to pay. The next morning they come to the area where the balloon should be, but nothing is evident. Sayid is ready to crucify Henry, but Ana warns they need to be positive before they do anything, so the three of them (incl. Charlie) separate to search the area more thoroughly.
Sawyer is spreading the news that Sun is pregnant, but since Jin doesn't really understand English, he doesn't know. He goes back to repair the garden he tore up and Sun finds him there. They have a heartfelt conversation full of regret and apologies. Sun tells him she is pregnant. Jin is ecstatic, but she tells him that she needs to tell him the full story.
Flashback...
Sun is walking her dog when the infertility doctor finds her. He is insistent that he needs to talk to her. He tells her he's really sorry, but he's made a terrible mistake. In fact it is Jin who cannot have children. He did not tell Jin this because he knows of Jin's line of business. He did not want his practice to be destroyed. However he felt Sun should know the truth.
Jin then wonders how Sun is pregnant if he could not have children. She swears she has never been with another man, and he says, well then it must be a miracle. They embrace but as the camera focuses on her over his shoulder, there is "a look."
In the hatch Jack lets Henry out of the locked room for breakfast (which appears to be a box of delicious Dharma-Os) as a wary Locke looks on. Henry Gale mentions the map he drew for Ana Lucia. Of course Jack and Locke know nothing about it. Then Henry says the following:
I guess it makes sense she didn't tell you with the two of you fighting all the time. Of course if I was one of them, these people you seem to think are your enemies, what would I do? Well, there'd be no balloon, so I'd draw a map to a real secluded place, like a cave or some underbrush, a good place for a trap. Ambush. And when your friends got there, a bunch of my people would be waiting for them. Then they'd use them to trade for me. I guess it's a good thing I'm not one of them, huh? <laughs> You guys got any milk?