Ginger ale. Ginger anything. I had puked for 7.5 months but I was a lot less sick on the days I drank ginger ale. I also hear they make ginger suckers. I've heard good things.
I'm with @dani_brewer I didn't buy a pillow but I have a "European" size one. It's super long and wouldn't have slept the little I did without it!! Must have!
Snoogle & belly band. I was able to wear my favourite jeans all the way through my whole pregnancy as they were low under lay under my tummy and the band comfortably covered the rest.
Re: Mom-to-be must-haves!