Honestly, I don't think I've watched the whole thing before now...I probably would have teared up pregnant or not.
Pre-kids, things like that would NEVER make me cry. Being a mom makes you sensitive to everything (and then being pregnant makes it even worse).
I just like having pregnancy as an excuse for being so emotional! Because I am really that emotional all the time and it BUGS DH so much! At least when I am pregnant I have an excuse.