we know juliet does not want to be on the island. she's repeatedly asked to leave but ben has denied her each time. she was supposed to leave with jack but since locke blew up the only way off the island (assuming the sub WAS the only was off the island), she's now trapped there.

we know ben was using her and making her do things she wouldn't normally do, like kill pickett, by dangling the opportunity to leave the island in front of her like a carrot on a stick. we also know she is a fertility doctor and was brought to the island to remedy a very specific problem; that women who conceive on the island always die before giving birth. up to this point, it appears as though her research has done nothing to fix the problem and women are still dying.

interestingly, what we also know is that juliet was sleeping with goodwin, and tom's comment regarding juliet and ben ("they've got history..."), seems to imply that there may have been a romantic relationship between the two. either way, juliet has had sex on the island.

now that she can't get off the island, it's strange that she's still doing ben's bidding. her sister had her child and was cured of her cancer (if it ever came back in the first place) so ben seemingly has no way of manipulating juliet to continue her work on pregnant women...

unless juliet is now personally involved in the very problem she was meant to fix. if she knows she's going to die, she has that much more reason to continue her research and find a cure soon. this would explain why she's still eager to help the man she claims to hate, and maybe give us insight into why juliet always seems to be wearing very loose-fitting clothes...

thats a good call - you could well be right about the possibility of Juliet being pregnant

Why would she risk this, she of all people knows the consequences of conceivivng on the island CERTAIN DEATH. She was recruited to rectify this problem and has been unable to do so, I really doubt she is also expecting. Unless she has a Deathwish.
I can see why you may think this, in bed with Goodwin , interest in Sun, but no.

pregnancy isnt always planned....

if she was so worried about the possibility of getting pregnant... why carry on the affair with goodwin? she knows the odds are good, she said it herself...

What if Ben recruited Goodwin to get her pregnant (faulty condum, etc.) so as to give her more of an incentive to find a cure.

The thing is we saw Juliet and Goodwin being intimate - that doesn't imply there was intercourse. Maybe they had a relationship, but knew the risks and didn't go there.