Why not to help her and do this duties, i think many men help to buy their house needs like food and other things.
Many married couples share duties so i don't think a good man refuse to help his pregnant wife and family.
The dynamics and responsibilities within a marriage can vary based on cultural norms, personal beliefs, and individual agreements between partners. There isn't a universal answer to whether it's the duty of a husband to buy and provide food for his wife, as this can be influenced by factors such as cultural traditions, gender roles, financial arrangements, and personal preferences.
In some cultures and relationships, it might be customary for one partner to take on certain responsibilities such as providing food, while in others, responsibilities might be shared equally or divided based on individual strengths and circumstances.