Pregnancy brain is a very real thing. I notice it the most when I'm typing (I start typing all the right letters in the wrong order, or I put spaces in the wrong places. I end up having to edit almost everything I post) and also when I'm driving. I can seriously feel my brain wanting to look at every pedestrian on the side of the road, every billboard, every car that drives past me. Normally I'm a very alert driver than rarely takes my eyes off the road, so pregnancy brain makes me nervous to drive sometimes.
In my last pregnancy, I totally buckled my son into his car seat, but forgot to buckle the car seat into the car, and didn't realize it until we went around a corner and his car seat flew off the seat. It was one of the scariest moments of my life! Thankfully he was okay, just scared, but I couldn't believe I had forgotten something so important.