Aw congrats on making it halfway!! I'm 19 wks today ... I feel the same way , the time just flew by , it feels like yesterday I was wearing my skinny jeans and today i'm living in jogging suits :d
i really hope you get to find out what you are having! I'm *hopefully* going to find out on tuesday ... At first all I wanted was a boy but now I just don't care as long as , like you said, they're healthy and happy, but i'm still pretty sure it's a boy!
Good luck with everything!