Your wife has a fucking watermelon growing inside her. I know it sucks to deal with the hormones and the needs and that shit, but at least you don't have to push a bowling ball out your dick hole, or deal with the discomfort of it all for 9 months.
I'm not of the "pregnant women can do no wrong" camp, so don't think that's what I'm saying. If she's expressing a particular need that involves you putting your hand on her stomach for a couple minutes a few times a week, I don't think that seems like too much work to keep her happy and make her feel like you're involved in this whole uncomfortable, rotten process.
That said, it fucking sucks to deal with a pregnant partner. There's a lot of setting aside of your own desires for that time, and then you're rewarded with a baby to deal with.
However, in the long run, I really do love my kids and my wife, and I would do it again. You're just starting, I'm 14 years into the process. It gets better, man. Not necessarily easier, but the challenges change, and the rewards grow. Keep working to stay positive, man. That's important.