Adjustment of Status - I-485

I had my interview yesterday, my lawyer said that we did well, even though i got one question wrong, it was only one! and its haunting me like crazy already, i don't know what to do, why they can't just give you a decision right there?!? why does it have to be 120 days, we had every single interview! i went in there with confidence on passing, my one year marriage is almost here, i had something planned for me and my wife, and now this, i don't understand, it feels like everytime i take a step forward then i take two back. case status online still says that EAD card was mailed, nothing about receiving my interview letter, I'm confused and worried. I called the lawyer and his secretary said why are you freaking out? you're fine, but its like you're not in my shoes, you don't understand, this is my life! after reading all the approved at the spot, i started crying because i couldn't get the same ....only one question when did your wife start working, i messed up, everything else was perfect!

sorry for the long letter, but i'm very worried and sad, but I'm gonna leave everything to God.