Sentence 1: Kay and Mike have been married for a decade. 
 Sentence 3: They tried many different methods and treatments, but to no avail 
 Sentence 4:  But yesterday, Mike came home from work and was met with some news 
 Sentence 5:  Kay was finally pregnant! 
 Option 1: They really want kids but have been unable to do so and Kay will never get pregnant. 
 Option 2: They really want kids but have been unable to do so.