No you are not alone!!!!! I get sad (I secretly get worried and sometimes think of what "could" happen), I also call my 2nd grader and kindergartener my babies!!! I have 5 children (gave birth via cesarean to 6, had one pass away) at home. But I still feel empty without my older boys!!! I am expecting our 7th, I am emotional about them going to school even when I am not pregnant. It's our motherly instinct!!! It's okay, we gotta be big girls, right!?