Hi,
Being a mother to a 14 month old little one, the best thing you can do is assure your wife with hugs and cuddles, rub in the back and foot massage (her being heavily pregnant) she needs that.
When the baby is born, make sure that your wife will have time for herself. It is great being with your love ones, at first and away from the family and country where she grew up and used to. But the homesickness hits after couple of weeks, and that is the very time you need to be strong for your wife.
Other than that she will be alright. It does take adjustments.