My wife has it bad this time around. She's become so forgetful that it's ridiculous. Luckily she can laugh it off instead of getting frustrated with herself. I tease her a lot about it and she takes it in good humor.
It sounds like she is the anxious type, Sinbian. Being forgetful doesn't change that anxiety, I've found. Sometimes it just means she'll fret about something, we'll resolve it, and then she'll forget the resolution.
I could live with the forgetfulness and even the anxiety. The worst was the mood swings, and my ex would get those with a vengeance. For a while during every pregnancy, I wanted to get out the silver cross and hang garlic garlands around the doorways!