Oh the angst! So sad! You really draw the reader in to the emotions and thoughts that each is having.

Slightly confusing at the end...Frank is actually sterile, so a child would be out of the question. I'm assuming this is Claire and Frank...

Use different sentences: don't just use simple ones-those are good for making an impact, but too many makes the 'flow' sort of raggedy. (Simple sentence: subject predicate); use sentences with and/or/but and conjunctions.

Otherwise, quite interesting.