Eh, yes lah, this is actually quite normal! A few of us have husbands like this, some guys are just more sensitive to certain things, whether it's food allergies, gastric issues, or even stress-related nausea, especially during the pregnancy period when tension runs high. The fact that you're not experiencing the same thing doesn't mean anything is wrong with him; everyone's body reacts differently, so he might just need to see a doctor to figure out what's triggering it, bisa food sensitivity, bisa juga anxiety from becoming a parent.