Being in a similar situ as your Mrs. I shall say sometimes I want sympathy which can be shown in getting little gifts of food or drinks for me from the cabinet, or a special treat from the store.
Sometimes I want a good back rub, sometimes I’d rather not be touched however as my skin is often irritated.
Gentle encouragement to get out for walks in the sunshine (for endorphins and vit-D).
A shopping spree for lovely preggy clothes which fit well and feel good (bamboo shirts are lush against the belly).
Ask if you can rub her belly (and maybe get some Lush massage bars to help moisturise as well as make it easier/gentler to rub). If you’re ok about feet ask if you can rub her feet.
Best thing to do tho is talk talk talk. Listen to her talk about this ache and that ache (think about the new brakes you want to get -but be there enough to respond properly), ask if there’s any solution she knows (but solutions are not always what’s wanted, sometimes just the listening is enough).
And while she may forget abt how awful pregnancy is…she may well not (it took me about a year to forget how ‘lovely’ it all was) so be prepared for her saying hahahahah NEVER AGAIN! 😉