oh no... I've got the pregnancy brain!

Sooooo I feel pretty dumb right now. I've been walking around all day with my pants mostly unbuttoned. I work in an office with a bunch of guys, so I feel like I could just die right now.  My husband even told me earlier before we left for work, but I was half asleep and really nauseous and was too focused on eating crackers to stop and fix it. I've been walking around for 3 hours at work like this... has anyone else had a pregnancy brain moment?