What if she told Sun and Ben that she concieved on island so that she could tell Sun good news and have a case that was not on island that she could say was and come up with some cure so that she could go home??? Just another thought.. Don't know that I believe it but another aspect to look at or concider

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Please don't give up, Des. Because all we really need to survive is one person who truly loves us. And you have her. I will wait for
you. Always. I love you, Pen

DESMOND: I love you, Penny. I've always loved you. I'm so sorry. I love you!
PENNY: I love you too.
DESMOND: I don't know where I am, but--
PENNY: I'll find you, Des--
DESMOND: --I promise--
PENNY: --no matter what--
DESMOND: --I'll come back to you--
PENNY: --I won't give up--
BOTH: I promise. I love you.