2nd pregnancy of my girlfriend in progress here. I would say this: The cravings she has are not yours. Let her eat the ice cream but you don’t have to join. I know it’s harder because, at least here, she always have cravings for shitty food. Learn to say no. It will be useful when you become a dad.
I also started working from home 100% about the same time she became pregnant the first time. I walked a lot less working from home.
I would look for other factor than the hormones. Activity level, stress, food sources, sleep. It’s probable that something changed on that level or something else but I really doubt your wife hormones made you gain 17 pounds. In fact, I have no doubt, this is not the case.