Bro honestly, I think by spending more time with her , appreciate her, letting her know that you're with her throughout the journey will be the best gift to her.
I took my wife for a movie 2 weeks back, while queing up to get our tickets, I saw her walking alone, looking at the movie posters, holding her tummy and somehow I felt quite touched by that image that I saw. I felt like I should be around her more and not letting her be or felt alone.
Now everytime before we go to bed, I'd ask her if she needs anything? water etc. I tuck her in bed, give her foot massage almost every night and I kiss her cheek and hug her everyday before sleep and after waking up.
I can see the difference now, she is happier and of course I get her flowers.
She love flowers, accasionally I suprise her with cute baby clothes that I bought online
All the best to you bro.